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Home My WebLink AboutFinal Drainage Plan & Map 042921Final Drainage Report Sienna Lake Subdivision, Phase II Little Rock, Arkansas CTA No. 068009-01 April 18, 2007 Owner/Developer: Cooper Land Development, Inc. 903 North 47th Street Rogers, Arkansas 72756 0001 ARKANSAS REGISTERED ROFESSIONAL Prepared by: No,n2169 ► ::o0 �-/(p/o-7 CRAFTON , TULL & ASSDCIATES, INC. Na. 109 9RkRNS4S [Nc-�� Crafton, Tull & Associates, Inc. 10825 Financial Center Parkway Little Rock, Arkansas 72211-3554 (501) 664-3245 / FAX (501) 664-6704 Internet: http:I/www.craftontull.com Engineers & Surveyors © 2006 Grafton, Tull & Associates, Inc. SHEET INDEX DRAINAGE LETTER VICINITY MAP QUAD MAP SOIL MAP FIRM PANELS AERIAL PHOTOGRAPH WEST BASIN: PRE -DEVELOPED DRAINAGE AREA MAP POST -DEVELOPED DRAINAGE AREA MAP TYPICAL POND CROSS-SECTION DETENTION CALCULATIONS SIENNA LAKE BASIN: DRAINAGE AREA MAP OUTLET STRUCTURE DETAILS COMPOSITE CN CALCULATIONS PRE -DEVELOPED DETENTION CALCULATIONS POST -DEVELOPED DETENTION CALCULATIONS OVERALL PHASE II: INLET AREA DRAINAGE MAP STORM SEWER DESIGN CALCULATIONS Crafton, Tull & Associates, Inc. This drainage report is submitted in fulfillment of the requirement for a storm water drainage report. PROJECT OWNER AND DEVELOPER: Cooper Land Development, Inc. 903 North 471h Street Rogers, Arkansas 72756 PROJECT LOCATION: The subject property is located southwest of David O. Dodd Road and northeast of Crystal Valley Road in Pulaski County, Arkansas. See the attached Vicinity Map for exact location. PROJECT DESCRIPTION: The project site contains approximately 363 acres of undeveloped land. The site is heavily wooded and contains a clear lake nestled in the northern portion of the property. The terrain is generally hilly with some flatter elevations located along the streams and surrounding the lake. SITE DRAINAGE: The property contains multiple drainage basins due to the hilly nature of the site. Yet, Sienna Lake Subdivision, Phase li can be divided into two main drainage basins. Because of the hilly terrain, runoff from these basins quickly forms into large channels which flow from the high elevations toward the southwest, and directly into Sienna Lake. These are referred to as from the West Basin and the Sienna Lake Basin respectfully. Please see the attached Drainage Area Maps for these basins. WEST BASIN Detention calculations for this basin were completed using the modified rational method per recommendation from the City of Little Rock, Arkansas's "Storm Water Management and Drainage Manual. Further investigation shows that the West Basin is split by a ridge as seen on the Drainage Area Map. Because the detention pond was likely to be quite large and we had little space to place a pond on the eastern part of the basin, we were forced to design only a dry pond on the western part of the basin. Therefore, we determined the Pre -development peak discharge for the entire basin as well as the Post -development peak discharge for the western part and the eastern part of this basin. We overcame the problem of only being able to detain the western part by over sizing the dry pond to account for the undetained runoff increase from the eastern part of the basin. See the West Basin Flow Summary and Detention Pond Summary below. The dry detention pond is a located in the southwest corner of the West Basin and is approximately 0.2 acres in size. The four feet deep pond has 3:1 side slopes and is penetrated by a 24" corrugated metal pipe. The 24" CMP releases the 100 Year storm event and a 3' rip - rap weir with 3:1 side slopes allows for release of anything over the 100 Year storm event. Times of Concentration for the basin was determined from the longest channel length in the basin and velocities taken from Figure 2-3 from the City of Little Rock, Arkansas's "Storm Water Management and Drainage Manual". SIENNA LAKE BASIN Detention calculations for this basin were completed using the SCS method per recommendation from the City of Little Rock, Arkansas's "Storm Water Management and Drainage Manual". Sienna Lake is approximately 16 acres in size and an earthen berm, located at the northeast corner, contains the lake waters. The berm is approximately 34 feet wide and 24.5 feet tall on the downstream side (dry side). Approximately 6 feet separates the top of the berm from the lake surface. The side slope of the berm on the dry side is approximately 3 foot horizontal to 1 foot vertical (3:1). The release structure for the lake consists of a 48 inch diameter standpipe with a grated inlet on top and a series of small weirs along the side. The approximately 22 feet deep standpipe discharges through a 24 inch pipe into a small basin at the bottom of the earthen berm. This small basin is created by an approximate 5 feet tall levee with a 10 feet wide surface. This levee is breached by a 48 inch corrugated metal pipe (CMP). This 48 inch CMP was clogged with debris at the time of investigation which causes an unnecessarily high pool level in the small basin. Just past the 48 inch CMP, adjoining property owners have excavated and formed yet another small pond. This privately owned pond is roughly horseshoe shaped and is approximately 3 acres in size. The levee is approximately 10 feet in height on the pond side and 20 feet on the downstream side (dry side) of the horseshoe pond. Draining this basin is another standpipe, leading to a 48 inch CMP flowing to a stream leading to McHenry Creek. The horseshoe basin was not considered to impact the water levels of Sienna Lake, therefore, was not implemented in the design calculations. To limit the post -developed discharges to below pre -developed amounts, a rectangular weir was implemented. This proposed concrete weir will have a 2.9 feet notch at an invert of 344.72. The top of the weir will be at the 100 Year water surface elevation of 347.27 feet and a top length of approximately 37.5 feet. The notch will allow the release of the 100 Year storm event, anything over the 100 Year storm will simply overflow above the weir notch. Times of Concentration for the basin was determined from the longest channel length in the basin and velocities taken from Figure 2-3 from the City of Little Rock, Arkansas's "Storm Water Management and Drainage Manual". WEST BASIN FLOW AND DENTENTION POND SUMMARY: Storm Total Post -Development etainePost-Development Total Event Pre -Developed Peak Discharge Flow Peak Discharge Post-Dev. Discharge West Sub -Basin (Past -Pond) East Sub -Basin = cfs Pre -Pond Ws) cfs Undetained cfs cfs 25- r 53.68 28.97 17.00 3 .67 = 50.67 1 00-r 64.89 35.02 20.70 40.76 = 61.46 WEST BASIN DETENTION P� OND SUMMARY: Storm Event Peak Discharge cfs Pea Elevation (ft) ax. Storage (ac-ft) 25- r 17.00 382.5 .386 100-yr 20.70 SIENNA LAKE BASIN FLOW SUMMARY: Storm Pre -Development Post -Development Runoff Event Peak Flow Peak Flow Increase cfs f cfs 25- r 261.27 401.36 140.09 1007r 1 357.51 526.27 168.76 SIENNA LAKE BASIN DETENTION POND (ACTUAL LAKE) SUMMARY: Pre -Developed Post -Developed Peak Peak Max. 7E7vent] Discharge Elevation Storage cfs ft ac-ft 25- r 47.67 1 345.73 64.296 1 00-r 59.78 1 346.52 80.113 Storm Peak Peak Max. Event Discharge Elevation Storage cfs ft ac-ft 25- r 47.64 6.3 345 76.530 1 00-r 1 51.11 347.27 1 95.688 EROSION AND SEDIMENT CONTROL: Erosion and sediment control will be achieved through the use of silt fences at the down slope sides of the proposed grading, straw filter barriers around the curb inlets, sand bag ditch checks placed in overland drainage swales, and rock ditch checks at the downstream sides of the storm sewer outlet flared end sections to prevent sediment from discharging off site. CONCLUSION: While the development of this property will increase the runoff from the site, the dry detention pond and the new outlet weir on Sienna Lake have the effect to limit the Post -Development discharges to below Pre -Developed Conditions. Complete and detailed design and analysis calculations for the proposed project are attached. All drainage design and computations were performed in accordance with the City of Little Rock, Arkansas Drainage Criteria Manual. Should you have any questions or require any additional information, please feel free to contact us at your convenience. CERTIFICATION: I, Bart J. Mink, Registered Professional Engineer No. 12169 in the State of Arkansas, hereby certify that the drainage designs, and specifications contained in this report have been prepared in accordance with the regulations of the Little Rock, Arkansas, the Professional Engineers Registration Act of the State of Arkansas, and reflect the application of generally accepted standard of engineering practice. Respectfully, Bart J. Mink, P.E. Civil Engineer Crafton, Tull & Associates, Inc. �00/ARKA SAS w ,+1 REGISTERED PROFESSIONAL � ENGI Fes. h, _41 A ./19 /0 7 CRAFTON, Tu;-L & ASSOCIA ES, INC. Na, 106 gP�ANSAS Et1��N�"�� U) Q U) qz X Q z O Y Q J a LL O Lu J_ O U) QI N 0 LL 0 1 fD Cr7 0 O N O 0 R m �a ■(D IIP5 0 uO n 00 a CL E �kf � ±-2 E o > $ \ 2k.a a� 2 $OL» $ 2 £ _� E : �$ \§ § 2 0/) b� 2 e£0 �2) / J $ CD6 fG9 2k R CLCL \ % E \ CA $ CL \ 22 / 2 E= IE 222 § §E I-e 22$ \ �e2 �®� CL ear r� 2� @ �02 m k£f Z � § 0= ƒ/E 2 0:k ,/ ± CDg� C =2 k 0S § §/ E E E�� om \ qp� S it: a) \ kk W(� CL I\ /�\ j � k t k I . ( 12 « ■ k k \ m ƒ 0 _ § ƒ � § . , \ { _ � 2 ) \ § 2 2 ƒ m I) 2 . - ( \ 7 7 a # \ § 2) 2 = ©$ \) o)dLU 63)))kƒk2 G�£ImQA333$�]£§�)JizM CL /aE--,x:zao,a>+,aa*■e � � � / i § / ■ � Soil Survey of Pulaski County, Arkansas Sienna Lake Subdivision Map Unit Legend Summary Pulaski County, Arkansas Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI An Amy -Urban land complex 1.0 0.3. . CbC Carnasaw-Urban land complex, 3 to 8 1.2 0.3 percent slopes CIVIC Carnasaw-Mountainburg association, . 40.2 11.2 undulating CMF Camasaw-Mountainburg association, 296.9 83.0 steep Re Rexorsilt loam, frequently flooded 2.5 0:7 W Water 15.9 4.4 USDA Ngural Rem em Web Soil Survey 1.1 9/8/2006 NO Ca¢oerratiao serriee National Cooperative Soil Survey Page 3 of 3 Job File: G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\SIENNA II WEST POND.PPW Rain Dir: G:\066009-01 Sienna Phase II\eng\Drainage\Pondpack\ JOB TITLE Project Date: 9/20/2006 Project Engineer: Bart J. Mink, P.E. Project Title: West Detention Pond Project Comments: SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 8:57 AM 9/21/2006 Table of Contents i ****************** TC CALCULATIONS ****************+** RAT.Q PRE....... Tc Calcs ........................... 1.01 ****************** RATIONAL METHOD CALCS ******************* RAT.Q PRE....... C and Area ......................... 2.01 Rational Peak Q's .................. 2.02 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 8:57 AM 9/21/2006 Type.... Tc Calcs Name.... RAT.Q PRE Page 1.01 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna II West Pond.ppw TIME OF CONCENTRATION CALCULATOR Segment #1: Tc: User Defined Segment #1 Time: .2720 hrs ------------------------------------------------------------------------ Total Tc: .2720 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 8:57 AM 9/21/2006 Type.... Tc Calcs Name.... RAT.Q PRE Page 1.02 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna II West Pond.ppw ------------------------------------------------------------------------ Tc Equations used... ------------------------------------------------------------------------ ==== User Defined Tc = Value entered by user Where: Tc = Time of concentration SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 8:57 AM 9/21/2006 Type.... C and Area Name.... RAT.Q PRE Page 2.01 File.... G:\066009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna II West Pond.ppw RATIONAL C COEFFICIENT DATA ......................................................................... ......................................................................... Area C x Area Soil/Surface Description C acres acres ------------------------------------------------------------ Predeveloped .5500 16.711 9.191 WEIGHTED C & TOTAL AREA ---> .5500 16.711 9.191 ......................................................................... SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 8.57 AM 9/21/2006 Type.... Rational Peak Q's Page 2.02 Name.... RAT.Q PRE SUMMARY OF RATIONAL METHOD PEAK DISCHARGES Q = CiA * Units Conversion; Where Conversion = 43560 / (12 * 3600) Rational Storms: CTA ROGERS Tag Freq File 100 100 Tag Freq C C adj (years) factor 25 25 .550 1.000 100 100 .550 1.000 IDF Curve ---------------- 100 - YEAR ROGER Tc = .2720 hrs ----------------------------- j C I Area I 1 final in/hr acres I I -----------------------------I I .550 5.7921 16.711 1 I .550 7.0021 16.711 1 ----------------------------- Peak Q cfs 53.68 64.89 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 8.57 AM 9/21/2006 Appendix A A-1 Index of Starting Page Numbers for ID Names ----- R ----- RAT.Q PRE... 1.01, 2.01, 2.02 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 8:57 AM 9/21/2006 Job File: G:\068009-01 Sienna Phase II\Acimin\P\P-RPT\Drainage\Pondpack\SIENNA II WEST POND Rain Dir: G:\068009-01 Sienna Phase II\Admire\P\P-RPT\Drainage\Pondpack\ JOB TITLE Project Date: 9/20/2006 Project Engineer: Bart J. Mink, P.E. Project Title: West Detention Pond • pcon Dsje. wan LA va -mrr am Project Comments: SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:39 AM 4/13/2007 Table of Contents i ********************** TC CALCULATIONS ********************* RAT.Q POST UNDET Tc Calcs ........................... 1.01 ****************** RATIONAL METHOD CALCS ******************* RAT.Q POST UNDET C and Area ......................... 2.01 Rational Peak Q's .................. 2.02 SIN: DOYXYWGX9N72 Crafton, Tull fE Associates PondPack (10.00.016.00) 9:39 AM 4/13/2007 Type.... Tc Calcs Name.... RAT.Q POST UNDET Page 1.01 File.... G:\068009-D1 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. TIME OF CONCENTRATION CALCULATOR Segment #1: TO: User Defined Segment #1 Time: .1970 hrs ------------------------------------------------------------------------ Total Tc: .1970 hrs ------------- SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:39 AM 4/13/2007 Type.... Tc Calcs Name.... RAT.Q POST UNDET Page 1.02 File.... G:\068009-01 Sienna Phase II\Admire\P\P-RPT\Drainage\Pondpack\Sienna iI West Pond. --------------------------- Tc Equations used... ------------------------------------------------------------------------ ==== User Defined Tc = Value entered by user Where: Tc = Time of concentration SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:39 AM 4/13/2007 Type.... C and Area Name.... RAT.Q POST UNDET Page 2.01 File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. RATIONAL C COEFFICIENT DATA ------------------------------------------------------------------------- Area C x Area Soil/Surface Description C acres acres -------------------------------- -- Post Undetained .6000 8.444 5.066 WEIGHTED C & TOTAL AREA ---> .6000 8.444 5.066 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:39 AM 4/13/2007 Type.... Rational Peak Q's Name.... RAT.Q POST UNDET Page 2.02 SUMMARY OF RATIONAL METHOD PEAK DISCHARGES Q = CiA * Units Conversion; Where Conversion = 43560 / (12 * 3600) Rational Storms: CTA ROGERS Tag Freq File IDF Curve 100 100 100Year AHTD Are Tc = .1970 hrs Tag Freq C C adj - -_------ 1CIArea---1 -------- Peak Q ----- (years) ------ ----- factor I final in/hr acres I cfs 25 25 .600 1.000 1 .600 6.5913 8.444 1 33.67 100 100 .600 1.000 I .600 ----------------------------- 7.9793 8.444 1 40.76 S/N: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:39 AM 4/13/2007 Appendix A A-1 Index of Starting Page Numbers for ID Names ----- R ----- RAT.Q POST UNDET... 1.01, 2.01, 2.02 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:39 AM 4/13/2007 Job File: G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\SIENNA II WEST POND Rain Dir: G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\ JOB TITLE Project Date: 9/20/2006 Project Engineer: Bart J. Mink, P.E. Project Title: West Detention Pond _ �brX('1.1Gr"ZdPt"p Q1�Y� Project Comments: SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM 4/13/2007 Table of Contents i ***************** MASTER SUMMARY***********W******** Watershed....... Mod. Rational Grand Summary ........ 1.01 Master Network Summary ............. 1.02 NETWORK SUMMARIES (DETAILED) *************** Watershed....... 25 Executive Summary (Nodes) .......... 2.01 Watershed....... 100 Executive Summary (Nodes) 2.02 ********************** TC CALCULATIONS ********************* POST DETAINED Q POST TcCalcs ........................... 3.01 ********************** POND VOLUMES ******************** WEST DET.POND... Vol: Elev-Area ..................... 4.01 ******************* OUTLET STRUCTURES ********************* Outlet Structure Outlet Input Data .................. 5.01 Composite Rating Curve ............. 5.04 +*+***************** POND ROUTING***********w*+***** WEST DET.POND... Pond E-V-Q Table ................... 6.01 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM 4/13/2007 Table of Contents ii WEST DET.PONDOUT 25 Pond Routing Summary ............... 6.02 WEST DET.PONDOUT 100 Pond Routing Summary ............... 6.03 RATIONAL METHOD CALCS ******************* POST DETAINED Q 25 Mod. Rational Graph ................ 7.01 Mod. Rational Storm Calcs .......... 7.02 Mod. Rational Hyg .................. 7.03 POST DETAINED Q 100 Mod. Rational Graph ................ 7.04 Mod. Rational Storm Calcs .......... 7.05 Mod. Rational Hyg .................. 7.06 POST DETAINED Q POST C and Area ......................... 7.07 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM .4/13/2007 Type.... Mod. Rational Grand Summary Page 1.01 Name.... Watershed File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. * * * + MODIFIED RATIONAL METHOD * ---- Grand Summary For All Storm Frequencies ---- + * Q = CiA * Units Conversion; Where Conversion = 43560 / (12 * 3600) Area = 8.267 acres Tc = .2720 hrs •••VOLUMES.'.. Freq. Adjusted Duration I Qpeak Allowablel Inflow Storage years 'C' ------------------------------------------------------ hrs in/hr cfs cfs I ac-ft ac-ft 25 .600 .5833 4.0599 20.31 --------------------- 20.01 I .979 .272 100. .600 .5833 4.9798 24.91 24.13 ! 1.201 .348 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM 4/13/2007 Type.... Master Network Summary Page 1.02 Name.... Watershed File.... G:1068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. MASTER DESIGN STORM SUMMARY Default Network Design Storm File, ID Rainfall Return Event Type ---------------------------- 25 I-D-F Curve 100 I-D-F Curve CTA ROGERS IDF ID ---------------- 25Year AHTD Area 100Year AHTD Are MASTER NETWORK SUMMARY Modified Rational Method Network (*Node=Outfall; +Node=Diversion;) (Trun= HYG Truncation: Blank=None; L--Left; R=Rt; LR=heft&Rt) Return HYG Vol Qpeak Node ID Type Event ac--ft Trun hrs ----------------- *OUTFALL ---- JCT ------ 25 ---------- .975 -- -------- .6000 *OUTFALL JCT 100 1.196 .6500 POST DETAINED Q AREA 25 .978 L .2720 POST DETAINED Q AREA 100 1.199 L .2720 WEST DET.PONDIN POND 25 .975 R .3000 WEST DET.PONDIN POND 100 1.196 R .3000 WEST DET.PONDOUT POND 25 .975 .6000 WEST DET.PONDOUT POND 100 1.196 .6500 Max Qpeak Max WSEL Pond Storage cfs ft ac-ft --------------------------- 17.00 20.70 20.31 24.91 20.31 24.91 17.00 382.56 .386 20.70 382.98 .462 SIN: DOYXYWGX9N72 . Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM 4/13/2007 Type.... Executive Summary (Nodes) Page 2.01 Name.... Watershed Event: 25 yr File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. Storm... 25Year AHTD Area Tag: 25 NETWORK SUMMARY -- NODES (Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left & Rt) DEFAULT Design Storm File,ID = Storm Tag Name = ❑❑❑❑❑❑ Data Type, File, ID = Total Rainfall Depth= .0000 in Duration Multiplier = 0 Resulting Duration = .0000 hrs Resulting Start Time= .0000 hrs Step= .0000 hrs Node ID Type Outfall OUTFALL JCT POST DETAINED Q AREA WEST DET.PONDIN POND WEST DET.PONDOUT POND HYG Vol Qpeak ac-ft Trun. hrs -------- ----------- .975 .6000 .978 L .2720 .975 R .3000 .975 .6000 End= .0000 hrs Qpeak Max WSEL cfa ft 17.00 20.31 20.31 17.00 382.56 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM 4/13/2007 Type.... Executive Summary (Nodes) Page 2.02 Name.... Watershed Event: 100 yr File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. Storm... 100Year AHTD Are Tag: 100 NETWORK SUMMARY -- NODES (Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left & Rt) DEFAULT Design Storm File,ID = Storm Tag Name = ❑❑C111 Data Type, File, ID = Total Rainfall Depth= .0000 in Duration Multiplier = 0 Resulting Duration = .0000 hrs Resulting Start Time= .0000 hrs Step= .0000 hrs End= .0000 hrs HYG Vol Qpeak Qpeak Max WSEL Node ID Type ac-ft Trun. hrs cfs ft Out€all OUTFALL JCT 1.196 .6500 20.70 POST DETAINED Q AREA 1.199 L .2720 24.91 WEST DET.PONDIN POND 1.196 R .3000 24.91 WEST DET.PONDOUT POND 1.196 .6500 20.70 382.98 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM 4/13/2007 Type.... Tc Calcs Page 3.01 Name.... POST DETAINED Q Tag: POST File.... G:\068009-01 Sienna Phase II\Admin\P\P-PPT\Drainag:e\Pondpack\Sienna II West Pond. TIME OF CONCENTRATION CALCULATOR ------------------------------------------------------------------------ Segment #1: Tc: User Defined Segment #1 Time; .2720 hrs ------------------------------------------------------------------------ Total Tc: .2720 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9.51 AM 4/13/2007 Type.... Tc Calcs Name.... POST DETAINED Q Tag: POST Page 3.02 File.— G:\068009-01 Sienna Phase II\Admin\P\P-PPT\Drainage\Pondpack\Sienna II West Pond. ------------------------------------------------------------------------ Tc Equations used... ------------------------------------------------------------------------ User Defined Tc = Value entered by user Where: Tc = Time of concentration SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10-00.016.00) 9:51 AM 4/13/2007 Type.... Vol: Elev-Area Name.... WEST DET.POND Page 4.01 File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. Elevation Planimeter (ft) (sq.in) ----------------------- 380.00 ----- 381.00 ----- 382.00 ----- 383.00 ------ 384.00 ----- Area Al+A2+sgr(A1*A2) Volume Volume Sum (acres) (acres) (ac-ft) (ac-ft) .1256 .0000 .000- - - .000 .1449 .4054 .135 .135 .1654 .4650 .155 .290 .1873 .5287 .176 .466 .2105 .5963 .199 .665 POND VOLUME EQUATIONS * Incremental volume computed by the Conic Method for Reservoir Volumes. Volume = (1/3) * (EL2-EL1) * (Areal + Area2 + sq.rt.(Areal*Area2)) where:. EL1, EL2 = Lower and upper elevations of the increment Areal,Area2 = Areas computed for EL1, EL2, respectively Volume = Incremental volume between EL1 and EL2 SIN. DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM 4/13/2007 Type.... Outlet Input Data Name.... Outlet Structure Page 5.01 File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. REQUESTED POND WS ELEVATIONS: Min. Elev.= 380.00 ft Increment = .25 ft Max. Elev.= 384.00 ft OUTLET CONNECTIVITY ---> Forward Flow Only (UpStream to DnStream) <--- Reverse Flow Only (DnStream to Upstream) < --- > Forward and Reverse Both Allowed Structure No. Outfall El, ft E2-, ft ----------------- ----------------------------- Culvert-Circular CO ---> TW 380.000 384.000 Weir-XY Points WO ---> TW 383.000 384.000 TW SETUP, DS Channel SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:51 AM 4/13/2007 Type.... Outlet Input Data Name.... Outlet Structure Page 5.02 File.... G:.\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. OUTLET STRUCTURE INPUT DATA Structure ID Structure Type ----------------- No. Barrels Barrel Diameter Upstream Invert Dnstream Invert Horiz. Length Barrel Length Barrel Slope = CO = Culvert -Circular ------------------ 1 2.0000 ft 380.00 ft 378.00 ft 35.00 ft 35.06 ft .05714 ft/ft OUTLET CONTROL DATA... Mannings n = .0220 Ke _ .5000 Xb = .035544 Kr = .5000 HW Convergence = .001 INLET CONTROL DATA... Equation form = 1 Inlet Control K = .0078 Inlet Control M = 2.0000 Inlet Control c - .03790 Inlet Control Y = .6900 T1 ratio (HW/D) - .000 T2 ratio (HW/D) = 1.268 Slope Factor = -.500 (forward entrance loss) (per ft of full flow) (reverse entrance loss) +/- ft Use unsubmerged inlet control Form 1 equ. below T1 elev. Use submerged inlet control Form 1 equ. above T2 elev. In transition zone between unsubmerged and submerged inlet control, interpolate between flows at T1 & T2... At T1 Elev = 380.00 ft ---> Flow = 15.55 c£s At T2 Elev = 382.54 ft ---> Flow = 17.77 cfs SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:51 AM 4/13/2007 Type.... Outlet Input Data Name.... Outlet Structure Page 5.03 File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. OUTLET STRUCTURE INPUT DATA Structure ID = WO Structure Type = Weir-XY Points ------------------------------------ # of Openings = 1 WEIR X-Y GROUND POINTS X, ft Elev, ft .00 384.00 3.00 383.00 6.00 383.00 9.00 384.00 Lowest Elev. = 383.00 ft Weir Coeff. _ .630000 Weir TW effects (Use adjustment equation) Structure ID = TW Structure Type = TW SETUP, DS Channel ------------------------------------ FREE OUTFALL CONDITIONS SPECIFIED CONVERGENCE TOLERANCES... Maximum Iterations= 40 Min. TW tolerance = .01 ft Max. TW tolerance = .01 ft Min. HW tolerance = .01 ft Max. HW tolerance = .01 ft Min. 4 tolerance = .00 cfs Max. Q tolerance = .00 cfs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM 4/13/2007 Type.... Composite Rating Curve Name.... Outlet Structure Page 5.04 ***** COMPOSITE OUTFLOW SUMMARY **** WS Elev, Total Q Notes ---------------- -------- Converge ------------------------- Elev. Q TW Elev Error ft cfs ft +/-ft Contributing Structures 380.00 .00 -- Free Outfall -------------------------- None contributing 380.25 .24 Free Outfall CO 380.50 .91 Free Outfall CO 380.75 1.99 Free Outfall CO 381.00 3.42 Free Outfall CO 381.25 5.16 Free Outfall CO 381.50 7.14 Free Outfall Co 381.75 9.32 Free Outfall CO 382.00 11.63 Free Outfall CO 382.25 14.01 Free Outfall CO 382.50 16.42 Free Outfall CO 382.75 18.79 Free Outfall CO 383.00 20.90 Free Outfall CO +WO 383.25 22.68 Free Outfall Co +WO 383.50 24.71 Free Outfall CO +WO 383.75 27.02 Free Outfall CO +W0 384.00 29.63 Free Outfall Co +WO SIN. DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM 4/13/2007 Type.... Pond E-V-Q Table Page 6.01 Name.... WEST DET.POND File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. LEVEL POOL ROUTING DATA HYG Dir = G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\ Inflow HYG file = NONE STORED - WEST DET.PONDIN 25 Outflow HYG file = NONE STORED - WEST DET.PONDOUT 25 Pond Node Data = WEST DET.POND Pond Volume Data = WEST DET.POND Pond Outlet Data = Outlet Structure No Infiltration INITIAL CONDITIONS Starting WS Elev = 380.00 ft Starting Volume = .000 ac-ft Starting Outflow = .00 cfs Starting Infiltr. _ .00 cfs Starting Total Qout= .00 cfs Time Increment - .0500 hrs Elevation Outflow Storage Area Infilt. Q Total 2S/t + 0 ft cfs ac-ft acres cfs cfs cfs ------------------------------------------------------------------------------ 380.00 .00 .000 .1256 .00 .00 .00 380.25 .24 .032 .1303 .00 .24 15.72 380.50 .91 .065 .1351 .00 .91 32.45 380.75 1.99 .100 .1399 .00 1.99 50.17 381.00 3.42 .135 .1449 .00 3.42 68.83 381.25 5.16 .172 .1499 .00 5.16 88.40 381.50 7.14 .210 .1550 .00 7.14 108.82 381.75 9.32 .249 .1601 .00 9.32 130.06 382.00 11.63 .290 .1654 .00 11.63 152.07 382.25 14.01 .332 .1707 .00 14.01 174.78 382.50 16.42 .376 .1762 .00 16.42 198.18 382.75 18.79 .420 .1817 .00 18.79 222.19 383.00 20.90 .466 .1873 .00 20.90 246.63 383.25 22.68 .514 .1930 .00 22.68 271.41 383.50 24.71 .563 .1967 .00 24.71 297.14 383.75 27.02 .613 .2045 .00 27.02 323.64 384.00 29.63 .665 .2105 .00 29.63 351.56 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM 4/13/2007 Type.... Pond Routing Summary Page 6.02 Name.... WEST DET.PONDOUT Tag: 25 Event: 25 yr File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. Storm... 25Year AHTD Area Tag: 25 LEVEL POOL ROUTING SUMMARY HYG Dir = G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\ Inflow HYG file = NONE STORED - WEST DET.PONDIN 25 Outflow HYG file = NONE STORED - WEST DET.PONDOUT 25 Pond Node Data = WEST DET.POND Pond Volume Data = WEST DET.POND Pond Outlet Data = Outlet Structure No Infiltration INITIAL CONDITIONS Starting WS Elev Starting Volume - Starting Outflow Starting Infiltr. _ Starting Total Qout= Time Increment = ------------- 380.00 ft .000 ac-ft .00 cfs .00 cfs .00 cfs .0500 hrs INFLOW/OUTFLOW HYDROGRAPH SUMMARY Peak Inflow = 20.31 cfs at .3000 hrs Peak ----------------------------------------------------- Outflow - 17.00 cfs at .6000 hrs Peak Elevation = 382.56 ft Peak Storage = .386 ac-ft MASS BALANCE (ac-ft) -------------------------- + Initial Vol = .000 • HYG Vol IN = .975 - Infiltration = .000 - HYG Vol OUT = .975 - Retained Vol = .000 Unrouted Vol = -.000 ac-ft (.001% of Inflow Volume) WARNING: Inflow hydrograph truncated on right side. SIN: DOYXYWGX9N72 PondPack (10.00.016.00) Crafton, Tull & Associates 9:51 AM 4/13/2007 Type.... Pond Routing Summary Page 6.03 Name.... WEST DET.PONDOUT Tag: 100 Event: 100 yr File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. Storm... 100Year AHTD Are Tag: 100 LEVEL POOL ROUTING SUMMARY HYG Dir = G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\ Inflow HYG file = NONE STORED - WEST DET.PONDIN 100 Outflow HYG file = NONE STORED - WEST DET.PONDOUT 100 Pond Node Data - WEST DET.POND Pond Volume Data = WEST DET.POND Pond Outlet Data = Outlet Structure No Infiltration INITIAL CONDITIONS Starting WS Elev = 380.00 ft Starting Volume .000 ac-ft Starting Outflow - .00 cfs Starting Infiltr. _ .00 cfs Starting Total Qout= .00 cfs Time Increment - .0500 hrs INFLOW/OUTFLOW HYDROGRAPH SUMMARY Peak Inflow = 24.91 cfs at .3000 hrs Peak Outflow = 20.70 cfs at .6500 hrs' ----------------------------------------------------- Peak Elevation = 382.98 ft Peak Storage = .462 ac-ft MASS BALANCE (ac-ft) -------------------------- + Initial Vol = .000 + HYG Vol IN = 1.196 - Infiltration = .000 - HYG Vol OUT = 1.196 - Retained Vol = .000 Unrouted Vol = -.000 ac-ft (.001% of Inflow Volume) WARNING: Inflow hydrograph truncated on right side. SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9.51 AM 4/13/2007 Type.... Mod. Rational Graph Page 7.01 Name.... POST DETAINED Q Tag: 25 Event: 25 yr File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. Storm... 25Year AHTD Area Tag: 25 MODIFIED RATIONAL METHOD ---- Graphical Summary for Maximum Required Storage ---- Method I Q.= CiA * Units Conversion; Where Conversion = 43560 / (12 * 3600) * RETURN FREQUENCY: 25 yr I Allowable Outflow: 20.01 cfs * 'C' Adjustment: 1.000 I Required Storage: .272 ac-ft ----------------------------------------------------------* * Peak Inflow: 20.31 cfs * .HYG File: 25 ¢ I Td = .5833 hrs I Return Freq: 25 yr /------- Approx. Duration for Max. Storage ------/ C adj.factor:1.000 f I I I Tc= .2720 hrs I I = 5.7921 in/hr I Area = 8.267 acres . Q = 28.97 cfs I Weighted C = .600 I- I Adjusted C = .600 I f I • f Required Storage 1 _-- -272 ac-ft I Td= .5833 hrs { ! I I = 4.0599 in/hr I xxxxxxxlxxxxxxxxxxx Q=20.31 cfs ! f I x x I O Q = 20.01 cfs I x o Ix (Allow.Outflow) I x o ! I x o NOT TO SCALE I x I x o I o I x ---------------------------------------------------- I------------ .5873 hrs T SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:51 AM 4/13/2007 Type.... Mod. Rational Storm Calcs Page 7.02 Name.... POST DETAINED Q Tag: 25 Event: 25 yr File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. Storm... 25Year AHTD Area Tag: 25 MODIFIED RATIONAL METHOD Summary for Single Storm Frequency ---- Q = CiA * Units Conversion; Where Conversion = 43560 / (12 + 3600) RETURN FREQUENCY: 25 yr 'C' Adjustment = 1.000Allowable Q = 20.01 cfs ---------------------------------------------------------------------------- Hydrograph Storm Duration, Td = .5833 hrs Tc = .2720 hrs Hydrograph File: 25 VOLUMES Wtd. Adjusted Duration Intens. Area Qpeak I Inflow Storage 'C' 'C' hrs in/hr acres cfs I ac-£t ac-ft --------------------------- .600 .600 .2720 ------------------------I-------------.-------- 5.7921 8.267 28.97 1 .651 .201 .600 .600 .3333 5.3198 8.267 26.61 I .733 .232 ..600 .600 .5000 4.4000 8.267 22.01 1 .909 271 ++++********}++++++*++++++++++++*+****+***++*+***+**+******+ Storage Maximum .600 .600 .5833 4.0599 8.267 20.31 1 .979 .272 .600 .600 .6667 3.7601 8.267 18.81 1 Qpeak < Qallow SIN: DOYXYWGX9N72 PondPack (10.00.016.00) Crafton, Tull & Associates 9:51 AM 4/13/2007 Type.... Mod. Rational Hyg Page 7.03 Name.... POST DETAINED Q Tag: 25 Event: 25 yr File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. Storm... 25Year AHTD Area Tag: 25 MODIFIED RATIONAL METHOD HYDROGRAPH Q = CiA * Units Conversion; Where Conversion = 43560 / (12 * 3600) Tag ----- Freq File IDF Curve 25 ------ 25 ------------ ----------------- 25Year AHTD Area Td ----------------------------- = .5833 hrs Tag Freq C C adj I C I Area I Peak Q ----- (years) ------ factor final ------ in/hr acres I cfs 25 25 ------ I-----------------------------I .600 1.000 I .600 ---------------------------- ---------- 4.0599 8.267 I .20.31 HYG file = HYG ID = POST DETAINED Q HYG Tag = 25. ----------------------------------- Peak Discharge = 20.31 cfs Time to Peak - .2720 hrs HYG Volume = .978 ac-ft ------------------------------------- WARNING: Hydrograph truncated on left side. HYDROGRAPH ORDINATES (cfs) Time I Output Time increment = .0500 hrs hrs I ------I-------------------------------------------------------------- Time on left represents time for first value in each row. .0220 I 1.64 5.37 9.11 12.84 16.57 .2720 I 20.31 20.31 20.31 20.31 20.31 .5220 I 20.31 20.31 17.42 13.69 9.95 .7720 I 6.22 2.49 .00 SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:51 AM 4/13/2007 Type.... Mod. Rational Graph Page 7.04 Name.... POST DETAINED Q Tag: 100 Event: 100 yr File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. Storm... 100Year AHTD Are Tag: 100 MODIFIED RATIONAL METHOD ---- Graphical Summary for Maximum Required Storage ---- Method I Q = CiA * Units Conversion; Where Conversion = 43560 / (12 * 3600) * RETURN FREQUENCY: 100 yr I Allowable outflow: 24.13 cfs * IC, Adjustment: 1.000 I Required Storage: .348 ac-ft *---------------------------------------------------------------------* * Peak Inflow: 24.91 cfs * .HYG File: 100 Q I Td = .5833 hrs I /-------- Approx. Duration for Max. Storage ------/ ! I I I Tc= .2720 hrs I I I = 7.0021 in/hr I . Q = 35.02 cfs I I ! I I I Required Storage I . .-- .348 ac-ft { I x x x x x x x!x x x x x x x x x x x I I ! x I - I x o I x o I x o NOT TO SCALE I x o I o -------------------------------------------------- Return Freq: 100 yr C adj.factor:1.000 Area = 8.267 acres Weighted C = .600 Adjusted C = .600 Td= .5833 hrs I = 4.9798 in/hr Q = 24.91 cfs x o Q = 24.13 cfs Ix (Aliow.Outflow) I I x I I x ----I------------- .5918 hrs T SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM 4/13/2007 Type.... Mod. Rational Storm Calcs Page 7.05 Name.... POST DETAINED Q Tag: 100 Event: 100 yr File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. Storm... 100Year AHTD Are Tag: 100 MODIFIED RATIONAL METHOD ---- Summary For Single Storm Frequency• Q = CiA * Units Conversion; Where Conversion = 43560 / (12 * 3600) RETURN FREQUENCY: 100 yr 'C' Adjustment = 1.00OAllowable Q = 24.13 cfs ---------------------------------------------------------------------------- Hydrograph Storm Duration, Td = .5633 hrs Tc = .2720 hrs Hydrograph File: 100 VOLUMES .. Wtd. Adjusted Duration Intens. Area Qpeak I Inflow Storage 'C' 'C' ----------------------------------------------------- hrs in/hr acres cfs 1 ac-ft ac-ft .600 .600 .2720 7.0021 8.267 I--------------------- 35.02-1 .787 .245 .600 .600 .3333 6.4297 8.267 32.16 I .886 .282 .600 ..600 .5000 5.3800 8.267 26.91 1 1.112 .342 +##***++*#+##*+++*##****++*+*+*+++++##**+++++++++#*+*+++##++ Storage Maximum .600 .600 .5833 4.9798 8.267 24.91 1 1.201 .348 .600 .600 .6667 4.6202 8.267 23.11 1 Qpeak < Qallow SIN: DOYXYWGX9N72 PondPack (10.00.016.00) Crafton, Tull & Associates 9:51 AM 4/13/2007 Type.... Mod. Rational Hyg Page 7.06 Name.... POST DETAINED Q Tag: 100 Event: 100 yr File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. Storm... 100Year AHTD Are Tag: 100 MODIFIED RATIONAL METHOD HYDROGRAPH Q = CiA * Units Conversion; Where Conversion = 43560 / (12 * 3600) Tag Freq File IDF Curve 100 100 100Year AHTD Are Td = .5833 hrs Tag Freq ----------------------------- C C adj I C I Area I Peak Q (years) factor 1 final in/hr acres I cfs ----- 100 ------- 100 ----- ------ I ----------------------------- .600 1.000 1 .600 ----------------------------- I---------- 4.9798 8.267 1 24.91 HYG file HYG ID = POST DETAINED Q HYG Tag = 100 ----------------------------------- Peak Discharge = 24.91 cfs Time to Peak = .2720 hrs HYG Volume = 1.199 ac-ft ----------------------------------- WARNING: Hydrograph truncated on left side. HYDROGRAPH ORDINATES (cfs) Time I Output Time increment = .0500 hrs hrs I Time on left represents time for first value in each row. ---------I-------------------------------------------------------------- .0220 1 2.01 6.59 11.17 15.75 20.33 .2720 1 24.91 24.91 24.91 24.91 24.91 .5220 1 24.91 24.91 21.37 16.79 12.21 .7720 1 7.63 3.05 .00 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM 4/13/2007 Type.... C and Area Page 7.07 Name .... POST DETAINED Q Tag: POST File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage \Pondpack\Sienna II West Pond. RATIONAL C COEFFICIENT DATA Area C x Area Soil/Surface Description C acres acres -- Postdevelopment Detained Area .6000 8.2674.960 WEIGHTED C & TOTAL AREA ---> .6000 8.267 4.960 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM 4/13/2007 C Type.... C and Area Name.... POST DETAINED Q Tag: POST Page 7.07 File.... G:\068009-01 Sienna Phase II\Admin\P\P-RPT\Drainage\Pondpack\Sienna II West Pond. Appendix A Index of Starting Page Numbers for ID Names ----- 0 ----- Outlet Structure... 5.01, 5.04 ----- P ----- POST DETAINED Q 25... 7.01, 7.02, 7.03, 7.04, 7.05, 7.06, 3.01, 7.07 ----- W Watershed... 1.01, 1.02, 2.01, 2.02 WEST DET.POND... 4.01, 6.01, 6.02, 6.03 A-1 SIN: DOYXYWGX9N?2 Crafton, Tull & Associates PondPack (10.00.016.00) 9:51 AM 4/13/2007 Sienna Lake Subdivision, Phase II Developed Conditions Composite "CN" Computations Hydraulic Soil Group C Wnforchod 1 Composite Area Ac. CN Value Product CN 40.24 83 3339.92 79-212 70 5544.84 119.452 8884.76 1 74.379 Residential District - 114 Ac. Lots Woods - Good Total Residential District - Woods -Good Total Residential District - 1/4 Ac. Woods -Good Total Lots 30.952 83 2569.016 13.901 70 f 97.07 44.853 3542.086 78.971 54.041 83 4485.403 4.61 70 -" 322.7 58.651 4808.103 81.978 Total Residential District - Woods -Good Total Residential District - 1/4 Ac. Woods -Good Total Lots 30.952 83 2569.016 13.901 70 f 97.07 44.853 3542.086 78.971 54.041 83 4485.403 4.61 70 -" 322.7 58.651 4808.103 81.978 Job File: G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\SIENNA LAKE PRE.PPW Rain Dir: G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ JOB TITLE Project Date: 6/5/2006 Project Engineer: Bart J. Mink Project Title: Sienna Lake Watershed Project Comments: SIN: DOYXYWGX9N72 PondPack (10.00.016.00) Grafton, Tull & Associates 9.47 AM 10/16/2006 Table of Contents i ********************** MASTER SUMMARY ********************** Watershed....... Master Network Summary ............. 1.01 ****************** DESIGN STORMS SUMMARY ******************* TYPE II - 25/100 Design Storms ...................... 2.01 TYPE II - 25/100 Pre100 Design Storms ...................... 2.02 ********************** TC CALCULATIONS ********************* WATERSHED 1..... Tc Calcs ........................... 3.01 WATERSHED 2..... Tc Calcs ........................... 3.03 WATERSHED 3..... Tc Calcs ........................... 3.05 ********************** CN CALCULATIONS ********************* WATERSHED 1..... Runoff CN-Area ..................... 4.01 WATERSHED 2..... Runoff CN-Area ..................... 4.02 WATERSHED 3..... Runoff CN-Area ..................... 4.03 ******************** RUNOFF HYDROGRAPHS ******************** Unit Hyd. Equations ................ 5.01 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Table of Contents ii WATERSHED 1..... Pre 25 Unit Hyd. Summary .................. 5.03 WATERSHED 1..... Pre10D Unit Hyd. Summary .................. 5.04 WATERSHED 2..... Pre 25 Unit Hyd. Summary .................. 5.05 WATERSHED 2..... Prel0Q Unit Hyd. Summary .................. 5.06 WATERSHED 3..... Pre 25 Unit Hyd. Summary .................. 5.07 WATERSHED 3..... Pre100 Unit Hyd. Summary .................. 5.08 *********************** POND VOLUMES *********************** SIENNA LAKE..... Vol: E1ev-Area ..................... 6.01 ******************** OUTLET STRUCTURES ********************* Outlet Structure Outlet Input Data .................. 7.01 Composite Rating Curve ............. 7.05 *********************** POND ROUTING *********************** SIENNA LAKE..... Pond E-V-Q Table ................... 8.01 SIENNA LAKE OUT Pre 25 Pond Routing Summary ............... 8.02 SIENNA LAKE OUT PrelO0 Pond Routing Summary ............... 8.03 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type .... Master Network Summary Page 1.01 Name.... Watershed File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw MASTER DESIGN STORM SUMMARY Network Storm Collection; TYPE II - 25/100 Total Depth Rainfall Return Event in Type RNF ID ------------ ---------------------- ---------------- Pre100 8.4700 Synthetic Curve Typell 24hr Pre 25 6.9700 Synthetic Curve Typell 24hr MASTER NETWORK SUMMARY SCS Unit Hydrograph Method (*Node=Outfall; +Node=Diversion;) (Trun= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left&Rt) Return HYG Vol Qpeak Node ID ----------------- Type Event ac-ft Trun hrs *OUTFALL ---- JCT ------ 100 ---------- 90.415 -- R --------- 16.1000 *OUTFALL JCT 25 66.705 R 15.9500 SIENNA LAKE IN POND 100 90.496 12.9000 SIENNA LAKE IN POND 25 66.764 12.9000 SIENNA LAKE OUT POND 100 90.415 R 16.1000 SIENNA LAKE OUT POND 25 66.705 R 15.9500 WATERSHED 1 AREA 100 48.485 13.2000 WATERSHED 1 AREA 25 35.771 13.2000 WATERSHED 2 AREA 100 18.206 12.9000 WATERSHED 2 AREA 25 13.432 12.9000 WATERSHED 3 AREA 100 23.805 12.5500 WATERSHED 3 AREA 25 17.562 12.6500 Max Qpeak Max WSEL Pond Storage cfS ft ac-ft ---------------------------- 59.78 47.67 357.51 261.27 59.78 47.67 176.50 128.96 61.39 59.55 133.31 97.48 346.52 80.113 345.73 64.296 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Design Storms Name.— TYPE II - 25/100 Page 2.01 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw Title... Project Date: 6/5/2006 Project Engineer: Bart J. Mink Project Title: Sienna Lake Watershed Project Comments: DESIGN STORMS SUMMARY Design Storm File,ID = Storm Tag Name = Pre100 TYPE II - 25/100 Data Type, File, ID = Synthetic Storm Type22 24hr Storm Frequency = 100 yr Total Rainfall Depth= 8.4700 in Duration Multiplier = 1 Resulting Duration = 24.0000 hrs Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs Storm Tag Name = Pre 25 Data Type, File, ID = Synthetic Storm TypeII 24hr Storm Frequency = 25 yr Total Rainfall Depth= 6.9700 in Duration Multiplier = 1 Resulting Duration = 24.0000 hrs Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Design Storms Page 2.02 Name.... TYPE II - 25/100 Event: 100 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw Storm... TypeII 24hr Tag: Pre100 DESIGN STORMS SUMMARY Design Storm File,ID = TYPE II - 25/100 Storm Tag Name = Pre100 Data Type, File, ID = Synthetic Storm TypeII 24hr Storm Frequency = 100 yr Total Rainfall Depth= 8.4700 in Duration Multiplier = 1 Resulting Duration = 24.0000 hrs Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs Storm Tag Name = Pre 25 Data Type, File, ID = Synthetic Storm TypeII 24hr Storm Frequency = 25 yr Total Rainfall Depth= 6.9700 in Duration Multiplier = 1 Resulting Duration = 24.0000 hrs Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:47 AM 10/16/2006 Type.... TC Calcs Name.... WATERSHED 1 Page 3.01 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw TIME OF CONCENTRATION CALCULATOR ........................................................................ Segment #1: Tc: Length & Vel. Hydraulic Length 3718.00 ft Avg.Velocity .49 ft/sec Segment #1 Time: 2.1077 hrs ------------------------------------------------------------------------- Total Tc: 2.1077 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 1 Page 3.02 File.... G:\068009-01 Sienna Phase ll\eng\Drainage\Pondpack\Sienna Lake Pre.ppw ------------------------------------------------------------------------- Tc Equations used... ------------------------------------------------------------------------- ==== User Defined Length & Velocity Tc = (Lf / V) / (3600sec/hr) Where: Tc = Time of concentration, hrs Lf = Flow length, ft V = Velocity, ft/sec SIN: DOXXXWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 2 Page 3.03 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw TIME OF CONCENTRATION CALCULATOR ------------------------------------------------------------------------ Segment #1: Tc: Length & Vel. Hydraulic Length 2900.00 ft Avg.Velocity .50 ft/sec Segment #1 Time: 1.6111 hrs ------------------------------------------------------------------------ Total Tc: 1.6111 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Tc Caics Name.... WATERSHED 2 Page 3.04 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw ------------------------------------------------------------------------ Tc Equations used... ------------------------------------------------------------------------ ==== User Defined Length & Velocity Tc = (Lf / V) / (3600sec/hr) Where: Tc = Time of concentration, hrs Lf = Flow length, ft V = Velocity, ft/sec SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 3 Page 3.05 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw ........................................................................ TIME OF CONCENTRATION CALCULATOR Segment #1: Tc: Length & Vel. Hydraulic Length 2115.00 ft Avg.Velocity .50 ft/sec Segment #1 Time: 1.1750 hrs -------------------------------- Total Tc: 1.1750 hrs SIN. DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Tc CalcS Name.... WATERSHED 3 Page 3.06 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw ------------------------------------------------------------------------ Tc Equations used... ------------------------------------------------------------------------ ==== User Defined Length & Velocity Tc = (Lf / V) / (3600sec/hr) Where: TC = Time of concentration, hrs Lf = Flow length, ft V = Velocity, ft/sec SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 aL' \Pa� Final Drainage Report Sienna Lake Subdivision, Phase II Little Rock, Arkansas CTA No. 068009-01 April 18, 2007 Owner/Developer: Cooper Land Development, Inc. 903 North 47th Street Rogers, Arkansas 72756 ARKANSAS 1REGIS'TERED ROFESSIONAL Prepared by: No✓12169 J. '-I Y,l o7 "y CRAFTON, TULL & `= ASSOCIATFS, INC. No. 109 9Rk'�NSAS ENG�N�"�� Crafton, Tull & Associates, Inc. 10825 Financial Center Parkway Little Rock, Arkansas 72211-3554 ® (501) 664-32451 FAX (501) 664-6704 Internet: http://www.craftontull.com Engineers & Surveyors © 2006 Crafton, Tull & Associates, Inc. SHEET INDEX DRAINAGE LETTER VICINITY MAP QUAD MAP SOIL MAP FIRM PANELS AERIAL PHOTOGRAPH WEST BASIN: PRE -DEVELOPED DRAINAGE AREA MAP POST -DEVELOPED DRAINAGE AREA MAP TYPICAL POND CROSS-SECTION DETENTION CALCULATIONS SIENNA LAKE BASIN: DRAINAGE AREA MAP OUTLET STRUCTURE DETAILS COMPOSITE CN CALCULATIONS PRE -DEVELOPED DETENTION CALCULATIONS POST -DEVELOPED DETENTION CALCULATIONS OVERALL PHASE II: INLET AREA DRAINAGE MAP STORM SEWER DESIGN CALCULATIONS c4i Crafton, Tull & Associates, Inc. Job File: G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\SIENNA LAKE PRE.PPW Rain Dir: G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ JOB TITLE Project Date: 6/5/2006 Project Engineer: Bart J. Mink Project Title: Sienna Lake Watershed Project Comments: SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:47 AM 10/16/2006 Table of Contents i **************** MASTER SUMMARY******************* Watershed....... Master Network Summary 1.01 ****************** DESIGN STORMS SUMMARY TYPE II - 25/1.00 Design Storms ...................... 2.01 TYPE II - 25/100 Prel00 Design Storms ...................... 2.02 *+****************** TC CALCULATIONS ******************* WATERSHED 1..... Tc Calcs ........................... 3.01 WATERSHED 2..... Tc Calcs ........................... 3.03 WATERSHED 3..... Tc Calcs ........................... 3.05 ************** CN CALCULATIONS *+***************** WATERSHED 1..... Runoff CN-Area ..................... 4.01 WATERSHED 2..... Runoff CN-Area ..................... 4.02 WATERSHED 3..... Runoff CN-Area ..................... 4.03 ******************* RUNOFF HYDROGRAPHS ******************** Unit Hyd. Equations ................ 5.01 S/N: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Table of Contents ii WATERSHED 1..... Pre 25 Unit Hyd. Summary .................. 5.03 WATERSHED 1..... Pre100 Unit Hyd. Summary .................. 5.04 WATERSHED 2..... Pre 25 Unit Hyd. Summary .................. 5.05 WATERSHED 2..... Pre100 Unit Hyd. Summary .................. 5.06 WATERSHED 3..... Pre 25 Unit Hyd. Summary .................. 5.07 WATERSHED 3..... Prel00 Unit Hyd. Summary .................. 5.08 ********************** POND VOLUMES *********************** SIENNA LAKE..... Vol: Elev-Area ..................... 6.01 ******************** OUTLET STRUCTURES ******************** Outlet Structure Outlet Input Data .................. 7.01 Composite Rating Curve ............. 7.05 *********************** POND ROUTING ********************** SIENNA LAKE..... Pond E-V-Q Table ................... 8.01 SIENNA LAKE OUT Pre 25 Pond Routing Summary ............... 8.02 SIENNA LAKE OUT Prel00 Pond Routing Summary ............... 8.03 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Master Network Summary Page 1.01 Name.... Watershed File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw MASTER DESIGN STORM SUMMARY Network Storm Collection: TYPE II - 25/100 Total Depth Rainfall Return Event in Type RNF ID Prel00 8.4700 Synthetic Curve TypeII 24hr Pre 25 6.9700 Synthetic Curve Typell 24hr MASTER NETWORK SUMMARY SCS Unit Hydrograph Method (*Node=Outfall; +Node=Diversion;) (Trun= HYG Truncation: Stank=None; L=Left; R=Rt; LR=Left&Rt) Return HYG Vol Qpeak Node ID Type Event ac-ft Trun hrs *OUTFALL JCT 100 90.415 R 16.1000 *OUTFALL JCT 25 66.705 R 15.9500 SIENNA LAKE IN POND 100 90.496 12.9000 SIENNA LAKE IN POND 25 66.764 12.9000 SIENNA LAKE OUT POND 100 90.415 R 16.1000 SIENNA LAKE OUT POND 25 66.705 R 15.9500 WATERSHED 1 AREA 100 48.485 13,2000 WATERSHED 1 AREA 25 35.771 13.2000 WATERSHED 2 AREA 100 18.206 12.9000 WATERSHED 2 AREA 25 13.432 12.9000 WATERSHED 3 AREA 100 23.805 12.5500 WATERSHED 3 AREA 25 17.562 12.6500 Max Qpeak Max WSEL Pond Storage cfs ft ac-ft 59.78 47.67 357.51 261.27 59.78 47.67 176.50 128.96 81.39 59.55 133.31 97.48 346.52 80.113 345.73 64.296 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Design Storms Name .... TYPE II - 25/100 Page 2.01 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw Title... Project Date: 6/5/2006 Project Engineer: Bart J. Mink Project Title: Sienna Lake Watershed Project Comments: DESIGN STORMS SUMMARY Design Storm File,10 = TYPE 11 - 25/100 Storm Tag Name = Pre100 Data Type, File, ID = Synthetic Storm TypeII 24hr Storm Frequency = 100 yr Total Rainfall Depth= 8.4700 in Duration Multiplier = 1 Resulting Duration = 24.0000 hrs Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs Storm Tag Name = Pre 25 Data Type, File, ID = Synthetic Storm TypeII 24hr Storm Frequency = 25 yr Total Rainfall Depth= 6.9100 in Duration Multiplier = 1 Resulting Duration = 24.0000 hrs Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Design Storms Page 2.02 Name.... TYPE II - 25/100 Event: 100 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw Storm... Typell 24hr Tag: Pre100 DESIGN STORMS SUMMARY Design Storm File,ID = Storm Tag Name = Fre100 TYPE II - 25/100 Data Type, File, ID = Synthetic Storm TypelI 24hr Storm Frequency = 100 yr Total Rainfall Depth= 8.4700 in Duration Multiplier = 1 Resulting Duration = 24.0000 hrs Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs Storm Tag Name = Pre 25 Data Type, File, ID = Synthetic Storm Typell 24hr Storm Frequency = 25 yr Total Rainfall Depth= 6.9700 in Duration Multiplier = 1 Resulting Duration = 24.0000 hrs Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 1 Page 3.01 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw TIME OF CONCENTRATION CALCULATOR Segment #1: TC: Length & Vel. Hydraulic Length 3718.00 ft Avg.Velocity .49 ft/sec Segment #1 Time: 2.1077 hrs ------------------------------------------------------------------ Total Tc: 2.1077 hrs S/N: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 1 Page 3.02 File.... G:\068009-01 Sienna Phase 11\eng\Drainage\Pondpack\Sienna Lake Pre.ppw ------------------------------------------------------------------------ Tc Equations used... ------------------------------------------------------------------------ ==== User Defined Length & Velocity Tc = (Lf / V) / (3600sec/hr) Where: Tc = Time of concentration, hrs Lf = Flow length, ft V = Velocity, ft/sec SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 2 Page 3.03 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw TIME OF CONCENTRATION CALCULATOR Segment #1: Tc: Length & Vel. Hydraulic Length 2900.00 ft Avg.Velocity .50 ft/sec Segment #1 Time: 1.6111 hrs ----------------------------------------------------------------------- Total Tc: 1.6111 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 2 Page 3.04 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw ------------------------------------------------------------------------ Tc Equations used... ------------------------------------------------------------------------- ==== User Defined Length & Velocity Tc = (Lf / V) I (3600sec/hr) Where: Tc = Time of concentration, hrs Lf = Flow length, ft V = Velocity, ft/sec SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 3 Page 3.05 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw .............................. TIME OF CONCENTRATION CALCULATOR Segment #1: Tc: Length & Vel. Hydraulic Length 2115.00 ft Avg.Velocity .50 ft/sec Segment #1 Time: 1.1750 hrs ------------------------------------------------------------------------ Total Tc: 1.1750 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00-016.00) 9:47 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 3 Page 3.06 File.... G:\068009-01 Sienna Phase Il\eng\Drainage\Pondpack\Sienna Lake Pre.ppw ----------------------------- Tc Equations used... ------------------------------------------------------------------------ ==== User Defined Length & Velocity Tc = (Lf / V) / (3600sec/hr) Where: Tc = Time of concentration, hrs Lf = Flow length, ft V = Velocity, ft/sec SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type .... Runoff CN-Area Name.... WATERSHED 1 Page 4.01 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw RUNOFF CURVE NUMBER DATA -------------------------------------------------------------------------- Impervious Area Adjustment Adjusted Soil/Surface Description CN acres %C %UC CN ------------------------------ Woods - good 70 119.452 70.00 COMPOSITE AREA & WEIGHTED CN ---> 119.452 70.00 (70) S/N: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Runoff CN-Area Name.... WATERSHED 2 Page 4.02 File.... G:\068009-01 Sienna Phase I11eng\Drainage\Pondpack\Sienna Lake Pre.ppw RUNOFF CURVE NUMBER DATA Impervious Area Adjustment Adjusted Soil/Surface Description CN acres %C RUC CN - Woods - good 70 44.854 70.00 COMPOSITE AREA & WEIGHTED CN ---> 44.854 70.00 (70) SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Runoff CN-Area Name.... WATERSHED 3 Page 4.03 RUNOFF CURVE NUMBER DATA -------------------------------------------------------------------------- Impervious Area Adjustment Adjusted Soil/Surface Description CN acres %C %UC CN -------------------------------- - Woods - good 70 58.651 70.00 COMPOSITE AREA & WEIGHTED CN ---> 58.651 70.00 (70) SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type._.. Unit Hyd. Equations Name.... Page 5.01 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw SCS UNIT HYDROGRAPH METHOD (Computational Notes) DEFINITION OF TERMS: ------------------------------------------------ At = Total area (acres): At = Ai+Ap Ai = Impervious area (acres) Ap = Pervious area (acres) CNi = Runoff curve number for impervious area CNp = Runoff curve number for pervious area fLoss = f loss constant infiltration (depth/time) gKs = Saturated Hydraulic Conductivity (depth/time) Md = Volumetric Moisture Deficit Psi = Capillary Suction (length) hK = Horton Infiltration Decay Rate (time'-1) fo = Initial Infiltration Rate (depth/time) fc = Ultimate(capacity)Infiltration Rate (depth/time) la = Initial Abstraction (length) dt = Computational increment (duration of unit excess rainfall) Default dt is smallest value of 0.1333Tc, rtm, and th (Smallest dt is then adjusted to match up with Tp) UDdt = User specified override computational main time increment (only used if UDdt is => .1333Tc) D(t) = Point on distribution curve (fraction of P) for time step t K = 2 / (1 + (Tr/Tp)): default K = 0.75: (for Tr/Tp = 1.67) Ks = Hydrograph shape factor = Unit Conversions * K: = ((lhr/3600sec) * (1ft/12in) * ((5280ft)**2/sq.mi)) * K Default Ks = 645.333 * 0.75 = 484 Lag = Lag time from center of excess runoff (dt) to Tp: Lag = 0.6Tc P = Total precipitation depth, inches Pa(t) = Accumulated rainfall at time step t Pi(t) = Incremental rainfall at time step t qp = Peak discharge (cfs) for lin. runoff, for lhr, for 1 sq.mi. = (Ks * A * Q) / Tp (where Q = lin. runoff, A=sq.mi.) Qu(t) = Unit hydrograph ordinate (cfs) at time step t Q(t) = Final hydrograph ordinate (cfs) at time step t Rai(t)= Accumulated runoff (inches) at time step t for impervious area Rap(t)= Accumulated runoff (inches) at time step t for pervious area Rii(t)= Incremental runoff (inches) at time step t for impervious area Rip(t)= Incremental runoff (inches) at time step t for pervious area R(t) = Incremental weighted total runoff (inches) Rtm = Time increment for rainfall table Si = S for impervious area: Si = (1000/CNi) - 10 Sp = S for pervious area: Sp = (1000/CNp) - 10 t = Time step (row) number Tc = Time of concentration Tb = Time (hrs) of entire unit hydrograph: Tb = Tp + Tr Tp = Time (hrs) to peak of a unit hydrograph: Tp = (dt/2) + Lag Tr = Time (hrs) of receding limb of unit hydrograph: Tr = ratio of Tp S/N: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Unit Hyd. Equations Page 5.02 Name.... File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw SCS UNIT HYDROGRAPH METHOD (Computational Notes) PRECIPITATION: ----------------------------------------------------------- Column (1): Time for time step t Column (2): D(t) = Point on distribution curve for time step t Column (3): Pi(t) = Pa(t) - Pa(t-1): Col.(4) - Preceding Col-(4) Column (4): Pa(t) = D(t) x P: Col.(2) x P PERVIOUS AREA RUNOFF (using SCS Runoff CN Method) ------------------------ Column (5): Rap(t) = Accumulated pervious runoff for time step t If (Pa(t) is <= 0.2Sp) then use: Rip(t) = 0.0 If (Pa(t) is > 0.2Sp) then use: Rap(t) _ (Col.(4)-0.2Sp)**2 / (Col.(4)+0.8Sp) Column (6): Rip(t) = Incremental pervious runoff for time step t Rip(t) = Rip(t) - Rap(t-1) Rip(t) = Col.(5) for current row - Col-(5) for preceding row. IMPERVIOUS AREA RUNOFF --------------------------------------------------- Column (7 & 8)... Did not specify to use impervious areas. INCREMENTAL WEIGHTED RUNOFF: --------------------------------------------- Column (9): R(t) _ (Ap/At) x Rip(t) + (Ai/At) x Rii(t) R(t) _ (Ap/At) x Col.(6) + (Ai/At) x Col.(8) SCS UNIT HYDROGRAPH METHOD: ----------------------------------------------- Column (10): Q(t) is computed with the SCS unit hydrograph method using R() and Qu(). SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Unit Hyd. Summary Page 5.03 Name.... WATERSHED 1 Tag: Pre 25 Event: 25 yr File.... G:\066009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw Storm... TypeII 24hr Tag: Pre 25 SCS UNIT HYDROGRAPH METHOD STORM EVENT: 25 year storm Duration = 24.0000 hrs Rain Depth = 6.9700 in Rain Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Rain File -ID = - TypeII 24hr Unit Hyd Type = Default Curvilinear HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ HYG File - ID = - WATERSHED 1 Pre 25 Tc = 2.1077 hrs Drainage Area = 119.452 acres Runoff CN= 70 Computational Time Increment = .28103-hrs Computed Peak Time = 13.2083 hrs Computed Peak Flow = 129.24 cfs Time Increment for HYG File .0500 hrs Peak Time, Interpolated Output = 13.2000 hrs Peak Flow, Interpolated Output = 128.96 cfs DRAINAGE AREA ID:WATERSHED 1 CN = 70 Area = 119.452 acres S = 4.2857 in 0.25 = .8571 in Cumulative Runoff ------------------- 3.5935 in 35.771 ac-ft HYG Volume... 35.771 ac-ft (area under HYG curve) ***** SCS UNIT HYDROGRAPH PARAMETERS ***** Time Concentration, Tc = 2.10771 hrs (ID: WATERSHED 1) Computational Incr, Tm = .28103 hrs = 0.20000 Tp Unit Hyd. Shape Factor = 483.432 (37.46% under rising limb) K T 483.43/645.333, K= .7491 (also, K= 2/(1+(Tr/Tp)) Receding/Rising, Tr/Tp = 1.6698 (solved from K = .7491) Unit peak, qp = 64.21 cfs Unit peak time Tp = 1.40514 hrs Unit receding limb, Tr = 5.62056 hrs Total unit time, Tb = 7.02570 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Unit Hyd. Summary Page 5.04 Name.... WATERSHED 1 Tag: Prel00 Event: 100 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw Storm... TypeII 24hr Tag: Prel00 SCS UNIT HYDROGRAPH METHOD STORM EVENT: 100 year storm Duration = 24.0000 hrs Rain Depth = 8.4700 in Rain Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Rain File -ID = - TypelI 24hr Unit Hyd Type = Default Curvilinear HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ HYG File - ID = - WATERSHED 1 Pre100 Tc = 2.1077 hrs Drainage Area = 119.452 acres Runoff CN= 70 Computational Time Increment = .28103 hrs Computed Peak Time = 13.2083 hrs Computed Peak Flow = 176.84 cfs Time Increment for HYG File = .0500 hrs Peak Time, Interpolated Output = 13,2000 hrs Peak Flow, Interpolated Output = 176.50 cfs DRAINAGE AREA ID:WATERSHED 1 CN = 70 Area = 119.452 acres S - 4.2857 in 0.25 = .8571 in Cumulative Runoff ------------------- 4.8708 in 48.486 ac-ft HYG Volume... 48.485 ac-ft (area under HYG curve) ***** SCS UNIT HYDROGRAPH PARAMETERS ***** Time Concentration, Tc = 2.10771 hrs (ID: WATERSHED 1) Computational Incr, Tm = .28103 hrs = 0.20000 Tp Unit Hyd. Shape Factor = 483.432 (37.46% under rising limb) K = 483.43/645.333, K = .7491 (also, K = 2/(1+(Tr/Tp)) Receding/Rising, Tr/Tp = 1.6698 (solved from K = .7491) Unit peak, qp = 64.21 cfs Unit peak time Tp = 1.40514 hrs Unit receding limb, Tr = 5.62056 hrs Total unit time, Tb = 7.02570 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Unit Hyd. Summary Page 5.05 Name.... WATERSHED 2 Tag: Pre 25 Event: 25 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw Storm... TypeII 24hr Tag: Pre 25 SCS UNIT HYDROGRAPH METHOD STORM EVENT: 25 year storm Duration = 24.0000 hrs Rain Depth = 6.9700 in Rain Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Rain File -ID = - TypeII 24hr Unit Hyd Type = Default Curvilinear HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ HYG File - ID = - WATERSHED 2 Pre 25 Tc = 1.6111 hrs Drainage Area = 44.854 acres Runoff CN= 70 Computational Time Increment = .21481 hrs Computed Peak Time - 12.8889 hrs Computed Peak Flow - 59.67 cfs Time Increment for HYG File - .0500 hrs Peak Time, Interpolated Output = 12.9000 hrs Peak Flow, Interpolated Output = 59.55 cfs DRAINAGE AREA ID:WATERSHED 2 CN = 70 Area = 44.854 acres S = 4.2857 in 0.25 = .8571 in Cumulative Runoff ------------------- 3.5935 in 13.432 ac-ft HYG Volume... 13.432 ac-ft (area under HYG Curve) ***** SCS UNIT HYDROGRAPH PARAMETERS ***** Time Concentration, Tc = 1.61111 hrs (ID: WATERSHED 2) Computational Incr, TM = .21481 hrs = 0.20000 Tp Unit Hyd. Shape Factor = 483.432 (37.46% under rising limb) K = 483.43/645.333, K = .7491 (also, K = 2/(1+(Tr/Tp)) Receding/Rising, Tr/Tp = 1.6698 (solved from K = .7491) Unit peak, qp = 31.54 cfs Unit peak time Tp = 1.07407 hrs Unit receding limb, Tr = 4.29630 hrs Total unit time, Tb = 5.37037 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Unit Hyd. Summary Page 5.06 Name.... WATERSHED 2 Tag: Pre100 Event: 100 yr File.... G:\068009--01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw Storm... TypelI 24hr Tag: Pre100 SCS UNIT HYDROGRAPH METHOD STORM EVENT: 100 year storm Duration = 24.0000 hrs Rain Depth = 8.4700 in Rain Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Rain File -ID = -- TypeII 24hr Unit Hyd Type = Default Curvilinear HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ HYG File - ID = - WATERSHED 2 Pre100 Tc = 1.6111 hrs Drainage Area = 44.854 acres Runoff CN= 70 Computational Time Increment - .21481 hrs Computed Peak Time = 12.8889 hrs Computed Peak Flow = 81.59 cfs Time Increment for HYG File = .0500 hrs Peak Time, Interpolated Output = 12.9000 hrs Peak Flow, Interpolated Output = 81.39 cfs DRAINAGE AREA ID:WATERSHED 2 CN = 70 Area = 44.854 acres S - 4.2857 in 0.25 = .8571 in Cumulative Runoff ------------------- 4.8708 in 18.206 ac-ft HYG Volume... 18.206 ac-ft (area under HYG curve) ***** SCS. UNIT HYDROGRAPH PARAMETERS ***** Time Concentration, Tc = 1.61111 hrs (ID: WATERSHED 2) Computational Incr, Tm = .21481 hrs = 0.20000 Tp Unit Hyd. Shape Factor = 483.432 (37.46% under rising limb) K = 483.43/645.333, K = .7491 (also, K = 2/(1t(Tr/Tp)) Receding/Rising, Tr/Tp = 1.6698 (solved from K .7491) Unit peak, qp = 31.54 cfs Unit peak time Tp = 1.07407 hrs Unit receding limb, Tr = 4.29630 hrs Total unit time, Tb = 5.37037 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Unit Hyd. Summary Page 5.07 Name.... WATERSHED 3 Tag: Pre 25 Event: 25 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw Storm... TypelI 24hr Tag: Pre 25 SCS UNIT HYDROGRAPH METHOD STORM EVENT: 25 year storm Duration = 24.0000 hrs Rain Depth = 6.9700 in Rain Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Rain File -ID = - TypelI 24hr Unit Hyd Type = Default Curvilinear HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ HYG File - ID = - WATERSHED 3 Pre 25 Tc = 1.1750 hrs Drainage Area = 58.651 acres Runoff CN= 70 Computational Time Increment = .15667 hrs Computed Peak Time = 12.6900 hrs Computed Peak Flow = 97.53 cfs Time Increment for HYG File = .0500 hrs Peak Time, Interpolated Output = 12.6500 hrs Peak Flow, Interpolated Output = 97.48 cfs DRAINAGE AREA ID:WATERSHED 3 CN = 70 Area = 58.651 acres S = 4.2857 in 0.2S = .8571 in Cumulative Runoff ------------------- 3.5935 in 17.563 ac-ft HYG Volume... 17.562 ac-ft (area under HYG curve) ***** SCS UNIT HYDROGRAPH PARAMETERS ***** Time Concentration, Tc = 1.17500 hrs (ID: WATERSHED 3) Computational Incr, Tm = .15667 hrs = 0.20000 Tp Unit Hyd. Shape Factor = 483.432 (37.46% under rising limb) K = 483.43/645.333, K = .7491 (also, K = 2/(1+(Tr/Tp)) Receding/Rising, Tr/Tp = 1.6698 (solved from K = .7491) Unit peak, qp = 56.56 cfs Unit peak time Tp = .78333 hrs Unit receding limb, Tr = 3.13333 hrs Total unit time, Tb = 3.91667 hrs S/N: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Unit Hyd. Summary Page 5.08 Name.... WATERSHED 3 Tag: Pre100 Event: 100 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna sake Pre.ppw Storm... TypeII 24hr Tag: Pre100 SCS UNIT HYDROGRAPH METHOD STORM EVENT: 100 year storm Duration = 24.0000 hrs Rain Depth = 8.4700 in Rain Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Rain File -ID = - TypeII 24hr Unit Hyd Type = Default Curvilinear HYG Dir = G:\068009-01 Sienna Phase iI\eng\Drainage\Pondpack\ HYG File - ID = - WATERSHED 3 Pre100 Tc = 1.1750 hrs Drainage Area = 58.651 acres Runoff CN= 70 Computational Time Increment = .15667 hrs Computed Peak Time = 12.5333 hrs Computed Peak Flow = 133.37 cfs Time Increment for HYG File = .0500 hrs Peak Time, Interpolated Output = 12.5500 hrs Peak Flow, Interpolated Output = 133.31 cfs DRAINAGE AREA ID:WATERSHED 3 CN 70 Area = 58.651 acres S = 4.2857 in 0.25 = .8571 in Cumulative Runoff ------------------- 4.8708 in 23.806 ac-ft HYG Volume... 23.805 ac-ft (area under HYG curve) ***** SCS UNIT HYDROGRAPH PARAMETERS ***** Time Concentration, Tc = 1.17500 hrs (ID: WATERSHED 3) Computational Incr, Tm = .15667 hrs = 0.20000 Tp Unit Hyd. Shape Factor = 483.432 (37.46% under rising limb) K = 483.43/645.333, K = .7491 (also, K = 2/(1+(Tr/Tp)) Receding/Rising, Tr/Tp = 1.6698 (solved from K = .7491) Unit peak, qp = 56.56 cfs Unit peak time Tp = .78333 hrs Unit receding limb, Tr = 3.13333 hrs Total unit time, Tb = 3.91667 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9.47 AM 10/16/2006 Type.... Vol: Elev-Area Name.... SIENNA LAKE Page 6.01 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw Elevation Planimeter Area Al+A2+sgr(A1*A2) Volume Volume Sum (ft) ------------------------------------------------------------------------ (sq.in) (acres) (acres) (ac-ft) (ac-ft) 342.00 ----- 15.0078 .0000 .000 .000 343.00 ----- 16.2040 46.8063 15.602 15.602 343.47 ----- 16.6761 49,3184 7.727 23.329 344.00 ----- 17.4002 51.1105 9.030 32.358 345.00 ----- 18.5964 53.9849 17.995 50.353 346.00 ----- 19.8205 57.6156 19.205 69.558 347.00 ----- 21.0462 61.2909 20.430 89.989 348.00 ----- 22.1842 64.8381 21.613 111.601 POND VOLUME EQUATIONS * Incremental volume computed by the Conic Method for Reservoir Volumes. Volume = (1/3) * (EL2-EL1) * (Areal + Area2 + sq.rt.(Areal*Area2)) where: EL1, EL2 = Lower and upper elevations of the increment Areal,Area2 = Areas computed for EL1, EL2, respectively Volume = Incremental volume between EL1 and EL2 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Outlet Input Data Name.... Outlet Structure Page 7.01 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw REQUESTED POND WS ELEVATIONS: Min. Elev.= 342.00 ft Increment = .50 ft Max. Elev.= 348.00 ft OUTLET CONNECTIVITY ---> Forward Flow Only (UpStream to DnStream) <--- Reverse Flow Only (DnStream to UpStream) < --- > Forward and Reverse Both Allowed Structure No. Outfall El, ft E2, ft Stand Pipe RO ---> CO 343.890 348.000 Orifice -Area 00 ---> CO 343.720 348.000 Culvert -Circular CO ---> TW 322.290 348.000 Weir-XY Points WO ---> TW 344.720 348.000 TW SETUP, DS Channel SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Outlet Input Data Name.... Outlet Structure Page 7.02 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre_ppw OUTLET STRUCTURE INPUT DATA Structure ID = RO Structure Type ------------------------------------ = Stand Pipe # of Openings - 1 Invert Elev. = 343.89 ft Diameter = 4.0000 ft Orifice Area = 12.5664 sq.ft Orifice Coeff. _ .600 Weir Length = 12.57 ft Weir Coeff. - 3.330 K, Reverse = 1.000 Mannings n = .0000 Kev,Charged Riser = .000 Weir Submergence = No Structure ID = 00 Structure Type ------------------------------------ = Orifice -Area # of Openings = 18 Invert Elev. = 343.72 ft Area = .0600 sq.ft Top of Orifice = .00 ft Datum Elev. = 343.72 ft Orifice Coeff. _ .600 S/N: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.C16.00) 9:47 AM 10/16/2006 Type.... Outlet Input Data Name .... Outlet Structure Page 7.03 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw OUTLET STRUCTURE INPUT DATA Structure ID = CO Structure Type = Culvert -Circular ------------------------------------ No. Barrels = 1 Barrel Diameter = 2.0000 ft Upstream Invert = 322.29 ft Dnstream Invert = 320.63 ft Horiz. Length = 167.00 ft Barrel Length = 167.01 ft Barrel Slope = .00994 ft/ft OUTLET CONTROL DATA... Mannings n = .0220 Ke = .7000 Kb = .035544 Kr - .7000 HW Convergence = .001 INLET CONTROL DATA... Equation form = 1 Inlet Control K = .0210 Inlet Control M = 1.3300 Inlet Control c = .04630 Inlet Control Y = .7500 T1 ratio (HW/D) _ .000 T2 ratio (HW/D) = 1.486 Slope Factor = -.500 (forward entrance loss) (per ft of full flow) (reverse entrance loss) +/- ft Use unsubmerged inlet control Form 1 equ. below T1 elev. Use submerged inlet control Form 1 equ. above T2 elev. In transition zone between unsubmerged and submerged inlet control, interpolate between flows at T1 & T2... At T1 Elev = 322.29 ft ---> Flow = 15.55 cfs At T2 Elev = 325.26 ft ---> Flow = 17.77 cfs SIN: D0YXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Outlet Input Data Name.... Outlet Structure Page 7.04 File.._. G:\068009-01 Sienna Phase II\ezig\Drainage\Pondpack\Sienna Lake Pre.ppw OUTLET STRUCTURE INPUT DATA Structure ID = WO Structure Type = Weir-XY Points ---------------------------------- # of Openings = 1 WEIR X-Y GROUND POINTS X, ft .00 4.23 8.45 12.67 14.74 16.61 27.29 37.76 45.06 Lowest Elev. Weir Coeff. Elev, ft Weir TW effects 348.00 347.00 346.00 345.00 344.72 345.00 346.00 347.00 348.00 344.72 ft 600000 (Use adjustment equation) Structure ID = TW Structure Type = TW SETUP, DS Channel ------------------------------------- FREE OUTFALL CONDITIONS SPECIFIED CONVERGENCE TOLERANCES... Maximum Iterations= 40 Min. TW tolerance = .01 ft Max. TW tolerance = .01 ft Min. HW tolerance = .01 ft Max. HW tolerance = .01 ft Min. Q tolerance = .00 cfs Max. Q tolerance = .00 cfs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00,016.00) 9:47 AM 10/16/2006 Type.... Composite Rating Curve Name.... Outlet Structure Page 7.05 ***** COMPOSITE OUTFLOW SUMMARY **** WS Elev, Total Q Notes ---------------- -------- Converge ------------------------- Elev. Q TW Elev Error ft cfs ft +/-ft Contributing Structures 342.00 -- .00 Free Outfall (no Q: RO,OO,CO,WO) 342.50 .00 Free Outfall (no Q. RO,OO,CO,WO) 343.00 .00 Free Outfall (no Q: RO,OO,CO3W0) 343.50 .00 Free Outfall (no Q: RO,OO,CO3W0) 343.72 .00 Free Outfall (no Q: RO,OO,CO3W0) 343.89 2.14 Free Outfall OO,CO (no Q: RO,WO) 344.00 4.28 Free Outfall RO,OO,CO (no Q: WO) 344.50 24.53 Free Outfall RO,OO,CO (no Q: WO) 344.72 36.84 Free Outfall RO,OO,CO (no Q: WO) 345.00 43.28 Free Outfall RO,CO,WO (no Q: 00) 345.50 45.44 Free Outfall RO,CO,WO (no Q: 00) 346.00 5C.24 Free Outfall R0,CO3W0 (no Q: 00) 346.50 59.15 Free Outfall RO,CO,WO (no Q: 00) 347.00 72.12 Free Outfall RO,CO,WO (no Q: 00) 347.50 90.33 Free Outfall RO,CO,WO (no Q: 00) 348.00 113.27 Free Outfall RO,CO,WO (no Q: 00) SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Pond E-V-Q Table Page 8.01 Name.... SIENNA LAKE File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw LEVEL POOL ROUTING DATA HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Inflow HYG file = NONE STORED - SIENNA LAKE IN Pre100 Outflow HYG file = NONE STORED - SIENNA LAKE OUT Pre100 Pond Node Data = SIENNA LAKE Pond Volume Data = SIENNA LAKE Pond Outlet Data = Outlet Structure No Infiltration INITIAL CONDITIONS Starting WS Elev = 343.72 ft Starting Volume = 27.540 ac-ft Starting Outflow = .00 cfs Starting Infiltr. _ .00 cfs Starting Total Qout= .00 cfs Time Increment = .0500 hrs Elevation Outflow Storage Area ft ---------------------------------------------- cfs ac-ft acres 342.00 .00 .000 15.0078 342.50 .00 7.652 15.6002 343.00 .00 15.602 16.2040 343.50 .00 23.830 16.7167 343.72 .00 27.540 17.0157 343.89 2.14 30.453 17.2487 344.00 4.28 32.358 17.4002 344.50 24.53 41.206 17.9933 344.72 36.84 45.194 18.2574 345.00 43.28 50.353 18,5964 345.50 45.44 59.803 19.2036 346.00 50.24 69.558 19.8205 346.50 59.15 79.620 20.4288 347.00 72.12 89.989 21.0462 347.50 90.33 100.653 21.6114 348.00 113.27 111.601 22.1842 SIN: DOYXYWGX9N72 PondPack (10.00.016.00) Infilt. Q Total 2S/t + O cfs cfs cfs ------------------------------- .00 .00 .00 .00 .00 3703.34 .00 .00 7551.41 .00 .00 11533.49 .00 .00 13329.39 .00 2.14 14741.27 .00 4.28 15665.63 .00 24.53 19968.29 .00 36.84 21910.58 .00 43.28 24414.19 .00 45.44 28989.95 .00 50.24 33716.46 .00 59.15 38595.35 .00 72.12 43626.61 .00 90.33 48806.25 .00 113.27 54128.29 Crafton, Tull & Associates 9:47 AM 10/16/2006 Type.... Pond Routing Summary Page 8.02 Name.... SIENNA LAKE OUT Tag: Pre 25 Event: 25 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw Storm... TypeII 24hr Tag: Pre 25 LEVEL POOL ROUTING SUMMARY HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Inflow HYG file = NONE STORED - SIENNA LAKE IN Pre 25 Outflow HYG file = NONE STORED - SIENNA LAKE OUT Pre 25 Pond Node Data = SIENNA LAKE Pond Volume Data = SIENNA LAKE Pond Outlet Data = Outlet Structure No Infiltration INITIAL CONDITIONS Starting WS Elev = 343.72 ft Starting Volume - 27.540 ac-ft Starting Outflow = .00 cfs Starting Infiltr. _ .00 cfs Starting Total Qout= .00 cfs Time Increment = .0500 hrs INFLOW/OUTFLOW HYDROGRAPH SUMMARY Peak Inflow = 261.27 cfs at 12.9000 hrs Peak Outflow = 47.67 cfs at 15.9500 hrs ----------------------------------------------------- Peak Elevation = 345.73 ft Peak Storage = 64.296 ac-ft MASS BALANCE (ac-ft) -------------------------- + Initial Vol = 27.540 + HYG Vol IN = 66.764 - Infiltration = .000 - HYG Vol OUT = 66.705 - Retained Vol = 27.599 Unrouted Vol = -.001 ac-ft (.001% of Inflow Volume) WARNING: Outflow hydrograph truncated on right side. S/N: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Type.... Pond Routing Summary Page 8.03 Name.... SIENNA LAKE OUT Tag: Prel00 Event: 100 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Pre.ppw LEVEL POOL ROUTING SUMMARY HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Inflow HYG file = NONE STORED - SIENNA LAKE IN Pre100 Outflow HYG file = NONE STORED - SIENNA LAKE OUT Pre100 Pond Node Data = SIENNA LAKE Pond Volume Data = SIENNA LAKE Pond Outlet Data = Outlet Structure No Infiltration INITIAL CONDITIONS Starting WS Elev - 343.72 £t Starting volume = 27.540 ac-ft Starting Outflow = .00 cfs Starting Infiltr. _ .00 cfs Starting Total Qout= .00 cfs Time Increment = .0500 hrs INFLOW/OUTFLOW HYDROGRAPH SUMMARY Peak Inflow = 357.51 cfs at 12.9000 hrs Peak ----------------------------------------------------- Outflow = 59.78 cfs at 16.1000 hrs Peak Elevation = 346.52 ft Peak Storage = 80.113 ac-ft MASS BALANCE -------------------------- (ac-ft) + Initial Vol - 27.540 + HYG Vol IN = 90.496 - Infiltration = .000 - HYG Vol OUT = 90.415 - Retained Vol = 27.621 Unrouted Vol = -.000 ac-ft (.000% of Inflow volume) WARNING: Outflow hydrograph truncated on right side. SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Appendix A A-1 Index of Starting Page Numbers for ID Names ----- 0 ----- Outlet Structure_.. 7.01, 7.05 ----- S ----- SIENNA LAKE... 6.01, 8.01, 8.02, 8.03 ----- T ----- TYPE II - 25/100... 2.01, 2.02 ----- W ----- Watershed... 1.01 WATERSHED 1... 3.01, 4.01, 5.03, 5.04 WATERSHED 2... 3.03, 4.02, 5.05, 5.06 WATERSHED 3... 3.05, 4.03, 5.07, 5.08 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 9:47 AM 10/16/2006 Job File: G:\06BO09-01 Sienna Phase ll\eng\Drainage\Pondpack\SIENNA LAKE POST - REVISED OU Rain Dir: 0:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ JOB TITLE Project Date: 6/5/2006 Project Engineer: Bart J. Mink Project Title: Sienna Lake Post Project Comments: SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Table of Contents i ******************** MASTER SUMMARY**************** Watershed....... Master Network Summary ............. 1.01 ****************** DESIGN STORMS SUMMARY ******************* TYPE II 25/100.. Design Storms ...................... 2.01 TYPE II 25/100.. Dev100 Design Storms ...................... 2.02 ***************** TC CALCULATIONS ******************* WATERSHED 1..... TC Calcs ........................... 3.01 WATERSHED 2..... Tc Calcs ........................... 3.03 WATERSHED 3..... Tc Calcs ........................... 3.05 *****************+** CN CALCULATIONS ******************* WATERSHED 1..... Runoff CN-Area ..................... 4.01 WATERSHED 2..... Runoff CN-Area ..................... 4.02 WATERSHED 3..... Runoff CN-Area ..................... 4.03 ******************* RUNOFF HYDROGRAPHS ******************** Unit Hyd. Equations ................ 5.01 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Table of Contents ii WATERSHED 1..... Dev 25 Unit Hyd. Summary .................. 5.03 WATERSHED 1..... Dev100 Unit Hyd. Summary .................. 5.04 WATERSHED 2..... Dev 25 Unit Hyd. Summary .................. 5.05 WATERSHED 2..... Dev100 Unit Hyd. Summary .................. 5.06 WATERSHED 3..... Dev 25 Unit Hyd. Summary .................. 5.07 WATERSHED 3..... Dev100 Unit Hyd. Summary .................. 5.08 **************+** POND VOLUMES ******************* SIENNA LAKE..... Vol: Elev-Area ..................... 6.01 ******************** OUTLET STRUCTURES ******************** Rectangular..... Outlet Input Data .................. 7.01 Composite Rating Curve ............. 7.05 ********************* POND ROUTING ******w************ SIENNA LAKE..... Pond E-V-Q Table ................... 8.01 SIENNA LAKE OUT Dev 25 Pond Routing Summary ............... 8.02 SIENNA LAKE OUT Dev100 Pond Routing Summary ............... 8.03 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Master Network Summary Page 1.01 Name.... Watershed File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out MASTER DESIGN STORM SUMMARY Network Storm Collection: TYPE II 25/100 Total Depth Rainfall Return Event in Type RNF ID Devl00 8.4700 Synthetic Curve TypeII 24hr Dev 25 6.9700 Synthetic Curve TypeII 24hr MASTER NETWORK SUMMARY SCS Unit Hydrograph Method (*Node=Outfall; +Node=Diversion;) (Trun= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left&Rt) Max Return HYG Vol Qpeak Qpeak Max WSEL Pond Storage Node ID ----------------- Type ---- Event ------ ac-ft Trun hrs cfs ft ac-ft *OUTFALL JCT 100 ---------- 106.164 -- R --------- 16,2500 -------- 51.11 -------- ------------ *OUTFALL JCT 25 80.812 R 15.6000 47.64 SIENNA LAKE IN POND 100 106.290 12.5500 526.27 SIENNA LAKE IN POND 25 80.898 12.5500 401.36 SIENNA LAKE OUT POND 100 106.164 R 16.2500 51.11 347.27 95.688 SIENNA LAKE OUT POND 25 80.812 R 15.6000 47.64 346.35 76.530 WATERSHED 1 AREA 100 53.238 12.9000 239.40 WATERSHED 1 AREA 25 39.977 12.9000 179.33 WATERSHED 2 AREA 100 22.227 12.6000 124.18 WATERSHED 2 AREA 25 17.031 12.6000 95.43 WATERSHED 3 AREA 100 30.825 12.4000 213.59 WATERSHED 3 AREA 25 23.890 12.4000 166.59 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Design Storms Name.... TYPE II 25/100 Page 2.01 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out Title... Project Date: 6/5/2006 Project Engineer: Bart J. Mink Project Title: Sienna hake Post Project Comments: DESIGN STORMS SUMMARY Design Storm File,ID = Storm Tag Name = Dev100 TYPE II 25/100 Data Type, File, ID = Synthetic Storm TypeII 24hr Storm Frequency = 100 yr Total Rainfall Depth= 8.4700 in Duration Multiplier = 1 Resulting Duration = 24.0000 hrs Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs Storm Tag Name = Dev 25 Data Type, File, ID = Synthetic Storm TypeIl 24hr Storm Frequency = 25 yr Total Rainfall Depth= 6.9700 in Duration Multiplier = 1 Resulting Duration = 24.0000 hrs Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Design Storms Page 2.02 Name.... TYPE II 25/100 Event• 100 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna make Post - revised out Storm... TypelI 24hr Tag: Dev100 DESIGN STORMS SUMMARY Design Storm File,ID = TYPE II 25/100 Storm Tag Name = DevIOO Data Type, File, ID = Synthetic Storm TypeIl 24hr Storm Frequency = 100 yr Total Rainfall Depth= 8.4700 in Duration Multiplier = 1 Resulting Duration = 24.0000 hrs Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs Storm Tag Name = Dev 25 Data Type, File, ID = Synthetic Storm TypeIl 24hr Storm Frequency = 25 yr Total Rainfall Depth= 6.9700 in Duration Multiplier = 1 Resulting Duration = 24.0000 hrs Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 1 Page 3.01 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out TIME OF CONCENTRATION CALCULATOR Segment #1: Tc: Length & Vel. Hydraulic Length 3718.00 ft Avg.Velocity .65 ft/sec Segment #1 Time: 1.5889 hrs ------------------------------------------------------------------------ Total Tc: 1.5889 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 1 Page 3.02 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out ------------------------------------------------------------------------- Tc Equations used... ------------------------------------------------------------------------ ==== User Defined Length & Velocity Tc = (Lf / V) / (3600sec/hr) Where: Tc = Time of concentration, hrs Lf = Flow length, ft V = Velocity, ft/sec SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 2 Page 3.03 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out ........................... TIME OF CONCENTRATION CALCULATOR Segment #1: Tc: Length & Vel. Hydraulic Length 2900.00 ft Avg.Velocity .68 ft/sec Segment #1 Time: 1.1846 hrs ----------------------------------------------------------------------- Total Tc: 1.1846 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10.01 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 2 Page 3.04 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out ------------------------------------------------------------------------ Tc Equations used... ------------------------------------------------------------------------ ==== User Defined Length & Velocity Tc = (Lf / V) / (3600sec/hr) Where: Tc = Time of concentration, hrs Lf = Flow length, ft V = Velocity, ft/sec S/N: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 3 Page 3.05 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out TIME OF CONCENTRATION CALCULATOR Segment 41: Tc: Length & Vel. Hydraulic Length 2115.00 ft Avg.Velocity .68 ft/sec Segment #1 Time: .8640 hrs ------------------------------------------------------------------------ Total Tc: .8640 hrs SIN. DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Tc Calcs Name.... WATERSHED 3 Page 3.06 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out ------------------------------------------------------------------------- Tc Equations used... ------------------------------------------------------------------------- ==== User Defined Length & Velocity Tc = (Lf / V) / (3600sec/hr) Where: Tc = Time of concentration, hrs Lf = Flow length, ft V = Velocity, ft/sec SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Runoff CN-Area Name.... WATERSHED 1 Page 4.01 File .... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out RUNOFF CURVE NUMBER DATA -------------------------------------------------------------------------- Impervious Area Adjustment Adjusted Soil/Surface Description CN acres %C wUC CN -------------------------- Composite 74 119,452 74.38 COMPOSITE AREA & WEIGHTED CN ---> 119.452 74.38 (74) SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Runoff CN-Area Name.... WATERSHED 2 Page 4.02 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out RUNOFF CURVE NUMBER DATA Impervious Area Adjustment Adjusted Soil/Surface Description CN acres %C %UC CN Composite 79 44.854 '78 97 COMPOSITE AREA & WEIGHTED CN ---> 44.854 78.97 (79) SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Runoff CN-Area Name.... WATERSHED 3 Page 4.03 RUNOFF CURVE NUMBER DATA -------------------------------------------------------------------------- Impervious Area Adjustment Adjusted Soil/Surface Description CN acres WC %UC CN -------------------------------- Composite 82 58.651 81.98 COMPOSITE AREA & WEIGHTED CN ---> 58.651 81.98 (82) SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Name.... File .... Unit Hyd. Equations Page 5.01 G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out SCS UNIT HYDROGRAPH METHOD (Computational Notes) DEFINITION OF TERMS: ------------------------------------------------ At = Total area (acres): At = Ai+Ap Ai = Impervious area (acres) Ap = Pervious area (acres) CNi = Runoff curve number for impervious area CNp = Runoff curve number for pervious area fLoss = f loss constant infiltration (depth/time) gKs = Saturated Hydraulic Conductivity (depth/time) Md = Volumetric Moisture Deficit Psi = Capillary Suction (length) hK = Horton Infiltration Decay Rate (time^-1) fo = Initial Infiltration Rate (depth/time) fc = Ultimate(capacity)infiltration Rate (depth/time) la = Initial Abstraction (length) dt = Computational increment (duration of unit excess rainfall) Default dt is smallest value of 0.1333Tc, rtm, and th (Smallest dt is then adjusted to match up with Tp) UDdt = User specified override computational main time increment (only used if UDdt is => .1333Tc) D(t) = Point on distribution curve (fraction of P) for time step t K = 2 / (1 + (Tr/Tp)): default K = 0.75: (for Tr/Tp = 1.67) Ks = Hydrograph shape factor = Unit Conversions * K: _ ((lhr/3600sec) * (lft/12in) * ((5280ft)**2/sq.mi)) * K Default Ks = 645.333 * 0.75 = 484 Lag = Lag time from center of excess runoff (dt) to Tp: Lag = 0.6Tc P = Total precipitation depth, inches Pa(t) = Accumulated rainfall at time step t Pi(t) = Incremental rainfall at time step t qp = Peak discharge (cfs) for tin. runoff, for lhr, for 1 sq.mi. _ (Ks * A * Q) / Tp (where Q = tin. runoff, A=sq.mi.) Qu(t) = Unit hydrograph ordinate (cfs) at time step t Q(t) = Final hydrograph ordinate (cfs) at time step t Rai(t)= Accumulated runoff (inches) at time step t for impervious area Rap(t)= Accumulated runoff (inches) at time step t for pervious area Rii(t)= Incremental runoff (inches) at time step t for impervious area Rip(t)= Incremental runoff (inches) at time step t for pervious area R(t) = Incremental weighted total runoff (inches) Rtm = Time increment for rainfall table Si = S for impervious area: Si = (1000/CNi) - 10 Sp = S for pervious area: Sp = (1000/CNp) - 10 t = Time step (row) number Tc m Time of concentration Tb = Time (hrs) of entire unit hydrograph: Tb = Tp + Tr Tp = Time (hrs) to peak of a unit hydrograph: Tp = (dt/2) + Lag Tr = Time (hrs) of receding limb of unit hydrograph: Tr = ratio of Tp S/N: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Unit Hyd. Equations Page 5.02 Name.... File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out SCS UNIT HYDROGRAPH METHOD (Computational Notes) PRECIPITATION: ----------------------------------------------------------- Column (1): Time for time step t Column (2): D(t) = Point on distribution curve for time step t Column (3): Pi(t) = Pa(t) - Pa(t-1). Col.(4) - Preceding Col.(4) Column. (4): Pa(t) = D(t) x P: Col.(2) x P PERVIOUS AREA RUNOFF (using SCS Runoff CN Method) ------------------------ Column (5): Rap(t) = Accumulated pervious runoff for time step t If (Pa(t) is <= 0.2Sp) then use: Rap(t) = 0.0 If (Pa(t) is > 0.2Sp) then use: Rap(t) _ (Col.(4)-0.2Sp)**2 / (Col.(4)+0.8Sp) Column (6): Rip(t) = Incremental pervious runoff for time step t Rip(t) = Rap(t) - Rap(t-1) Rip(t) = Col-(5) for current row - Col-(5) for preceding row. IMPERVIOUS AREA RUNOFF --------------------------------------------------- Column (7 & 8)... Did not specify to use impervious areas. INCREMENTAL WEIGHTED RUNOFF: --------------------------------------------- Column (9): R(t) _ (Ap/At) x Rip(t) + (Ai/At) x Rip(t) R(t) _ (Ap/At) x Col.(6) + (Ai/At) x Col-(8) SCS UNIT HYDROGRAPH METHOD: ---------------------------------------------- Column (10): Q(t) is computed with the SCS unit hydrograph method using R ( ) and Qu U . S/N• DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 10.01 AM 10/16/2006 Type.... Unit Hyd. Summary Page 5.03 Name.... WATERSHED 1 Tag: Dev 25 Event: 25 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out Storm... Typell 24hr Tag: Dev 25 SCS UNIT HYDROGRAPH METHOD STORM EVENT: 25 year storm Duration = 24.0000 hrs Rain Depth = 6.9700 in Rain Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Rain File -ID = - TypeII 24hr Unit Hyd Type = Default Curvilinear HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ HYG File - ID = - WATERSHED 1 Dev 25 Tc = 1.5889 hrs Drainage Area = 119.452 acres Runoff CN= 74 Computational Time Increment = .21185 hrs Computed Peak Time = 12.9230 hrs Computed Peak Flow = 179.93 cfs Time Increment for HYG File - .0500 hrs Peak Time, Interpolated Output = 12.9000 hrs Peak Flow, Interpolated Output = 179.33 cfs DRAINAGE AREA ID:WATERSHED 1 CN = 74 Area = 119.452 acres S = 3.5135 in 0.2S = .7027 in Cumulative Runoff ------------------- 4.0159 in 39.976 ac-ft HYG Volume... 39.977 ac-£t (area under HYG curve) ***** SCS UNIT HYDROGRAPH PARAMETERS ***** Time Concentration, Tc = 1.58889 hrs (ID: WATERSHED 1) Computational Incr, Tm = .21185 hrs = 0.20000 Tp Unit Hyd. Shape Factor = 483.432 (37.46W under rising limb) K = 483.43/645.333, K = .7491 (also, K = 2/(1f(Tr/Tp)) Receding/Rising, Tr/Tp = 1.6696 (solved :From K = .7491) Unit peak, qp = 85.18 cfs Unit peak time Tp = 1.05926 hrs Unit receding limb, Tr = 4.23704 hrs Total unit time, Tb = 5.29630 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type .... Unit Hyd. Summary Page 5.04 Name.... WATERSHED 1 Tag: Dev100 Event: 100 yr File .... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna rake Post - revised out Storm... TypeII 24hr Tag: Dev100 SCS UNIT HYDROGRAPH METHOD STORM EVENT: 100 year storm Duration = 24.0000 hrs Rain Depth = 8.4700 in Rain Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Rain File -ID = - Typell 24hr Unit Hyd Type = Default Curvilinear HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ HYG File - ID = - WATERSHED 1 Dev100 Tc = 1.5889 hrs Drainage Area = 119.452 acres Runoff CN= 74 Computational Time Increment = .21185 hrs Computed Peak Time = 12.9230 hrs Computed Peak Flow = 240.05 cfs Time Increment for HYG File = .0500 hrs Peak Time, Interpolated Output = 12.9000 hrs Peak Flow, Interpolated Output = 239.40 cfs DRAINAGE AREA ID:WATERSHED 1 CN = 74 Area = 119.452 acres S = 3.5135 in 0.25 = 7027 in Cumulative Runoff ------------------- 5.3481 in 53.237 ac-ft HYG Volume.._ 53.238 ac-ft (area under HYG curve) ***** SCS UNIT HYDROGRAPH PARAMETERS ***** Time Concentration, To = 1.58889 hrs (ID: WATERSHED 1) Computational Incr, Tin = .21185 hrs = 0.20000 Tp Unit Hyd. Shape Factor = 483.432 (37.46% under rising limb) K = 483.43/645.333, K = .7491 (also, K = 2/(1+(Tr/Tp)) Receding/Rising, Tr/Tp = 1.6698 (solved from K = .7491) Unit peak, qp = 85.18 cfs Unit peak time Tp = 1.05926 hrs Unit receding limb, Tx = 4.23704 hrs Total unit time, Tb = 5.29630 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Unit Hyd. Summary Page 5.05 Name.... WATERSHED 2 Tag: Dev 25 Event: 25 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out Storm... TypeII 24hr Tag: Dev 25 SCS UNIT HYDROGRAPH METHOD STORM EVENT: 25 year storm Duration = 24.0000 hrs Rain Depth = 6.9700 in Rain Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Rain File -ID = - TypeII 24hr Unit Hyd Type = Default Curvilinear HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ HYG File - ID = - WATERSHED 2 Dev 25 Tc = 1.1846 hrs Drainage Area = 44.854 acres Runoff CN= 79 Computational Time Increment - .15795 hrs Computed Peak Time = 12.6362 hrs Computed Peak Flow = 96.00 cfs Time Increment for HYG File = .0500 hrs Peak Time, Interpolated Output = 12.6000 hrs Peak Flow, Interpolated Output = 95.43 cfs DRAINAGE AREA ID:WATERSHED 2 CN = 79 Area = 44.854 acres S - 2.6582 in 0.25 = .5316 in Cumulative Runoff ------------------- 4.5569 in 17.033 ac-ft HYG Volume... 17.031 ac-ft (area under HYG curve) ***** SCS UNIT HYDROGRAPH PARAMETERS ***** Time Concentration, Tc = 1.18464 hrs (ID: WATERSHED 2) Computational Incr, Tm = .15795 hrs = 0.20000 Tp Unit Hyd. Shape Factor = 483.432 (37.46% under rising limb) K = 483.43/645.333, K = .7491 (also, K = 2/(1+(Tr/Tp)) Receding/Rising, Tr/Tp = 1.6698 (solved from K = .7491) Unit peak, qp = 42.90 cfs Unit peak time Tp = .78976 hrs Unit receding limb, Tr = 3.15904 hrs Total unit time, Tb = 3.94880 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Unit Hyd. Summary Page 5.06 Name.... WATERSHED 2 Tag: Dev100 Event: 100 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out Storm... TypeII 24hr Tag: Dev100 SCS UNIT HYDROGRAPH METHOD STORM EVENT: 100 year storm Duration = 24.0000 hrs Rain Depth = 6.4700 in Rain Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Rain File -ID = - TypeII 24hr Unit Hyd Type = Default Curvilinear HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ HYG File - ID = - WATERSHED 2 Dev100 To = 1.1846 hrs Drainage Area = 44.854 acres Runoff CN= 79 Computational Time Increment = .15795 hrs Computed Peak Time = 12.6362 hrs Computed Peak Flow = 124.81 cfs Time Increment for HYG File = .0500 hrs Peak Time, Interpolated Output = 12.6000 hrs Peak Flow, Interpolated Output = 124.18 cfs DRAINAGE AREA ID:WATERSHED 2 CN = 79 Area = 44.854 acres S = 2.6582 in 0.25 = .5316 in Cumulative Runoff ------------------- 5.9470 in 22.229 ac-ft HYG Volume... 22.227 ac-ft (area under HYG curve) ***** SCS UNIT HYDROGRAPH PARAMETERS ***** Time Concentration, Tc = 1.18464 hrs (ID: WATERSHED 2) Computational Incr, Tm = .15795 hrs = 0.20000 Tp Unit Hyd. Shape Factor = 483.432 (37.461 under rising limb) K = 483.43/645.333, K = .7491 (also, K = 2/(l+(Tr/Tp)) Receding/Rising, Tr/Tp = 1.6698 (solved from K = .7491) Unit peak, qp = 42.90 cfs Unit peak time Tp = .78976 hrs Unit receding limb, Tr = 3.15904 hrs Total unit time, Tb = 3.94880 hrs S/N: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Unit Hyd. Summary Page 5.07 Name.... WATERSHED 3 Tag: Dev 25 Event: 25 yr File.... G.\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out Storm... TypelI 24hr Tag: Dev 25 SCS UNIT HYDROGRAPH METHOD STORM EVENT: 25 year storm Duration = 24.0000 hrs Rain Depth = 6.9700 in Rain Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Rain File -ID = - TypeII 24hr Unit Hyd Type = Default Curvilinear HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ HYG File - ID = - WATERSHED 3 Dev 25 Tc = .8640 hrs Drainage Area = 58.651 acres Runoff CN= 82 Computational Time Increment = .11520 hrs Computed Peak Time = 12.4412 hrs Computed Peak Flow = 167.02 cfs Time Increment for HYG File = .0500 hrs Peak Time, Interpolated Output = 12.4000 hrs Peak Flow, Interpolated Output = 166.59 cfs DRAINAGE AREA ID:WATERSHED 3 CN = 82 Area = 58.651 acres S = 2.1951 in 0.25 = .4390 in Cumulative Runoff ------------------- 4.8881 in 23.891 ac-ft HYG Volume... 23.890 ac-ft (area under HYG curve) ***** SCS UNIT HYDROGRAPH PARAMETERS ***** Time Concentration, TC = .86397 hrs (ID: WATERSHED 3) Computational Incr, Tm = .11520 hrs = 0.20000 Tp Unit Hyd. Shape Factor = 483.432 (37.46% under rising limb) K = 483.43/645.333, K = .7491 (also, K = 2/(1+(Tr/Tp)) Receding/Rising, Tr/Tp = 1.6698 (solved from K = .7491) Unit peak, qp = 76.92 cfs Unit peak time Tp = .57598 hrs Unit receding limb, Tr = 2.30392 hrs Total unit time, Tb = 2.87990 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Unit Hyd. Summary Page 5.08 Name .... WATERSHED 3 Tag: Devl00 Event: 100 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out Storm... Typell 24hr Tag: DevIO0 SCS UNIT HYDROGRAPH METHOD STORM EVENT: 100 year storm Duration = 24.0000 hrs Rain Depth = 8.4700 in Rain Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Rain File -ID = - Typell 24hr Unit Hyd Type = Default Curvilinear HYG Dir = G:\068009-01 Sienna Phase i2\eng\Drainage\Pondpack\ HYG File - ID = - WATERSHED 3 DevIO0 To = .8640 hrs Drainage Area = 58.651 acres Runoff CN= 82 Computational Time Increment - .11520 hrs Computed Peak Time = 12.4412 hrs Computed Peak Flow = 213.86 cfs Time Increment for HYG File = .0500 hrs Peak Time, Interpolated Output = 12.4000 hrs Peak Flow, Interpolated Output = 213.59 cfs DRAINAGE AREA ID:WATERSHED 3 CN = 82 Area = 58.651 acres S = 2.1951 in 0.25 = .4390 in Cumulative Runoff ------------------- 6.3071 in 30.826 ac-ft HYG Volume... 30.825 ac-ft (area under HYG curve) ***** SCS UNIT HYDROGRAPH PARAMETERS ***** Time Concentration, To = .86397 hrs (ID: WATERSHED 3) Computational Incr, Tm = .11520 hrs = 0.20000 Tp Unit Hyd. Shape Factor = 483.432 (37.46% under rising limb) K = 483,43/645.333, K = .7491 (also, K = 2/(1+(Tr/Tp)) Receding/Rising, Tr/Tp = 1.6698 (solved from K = .7491) Unit peak, qp = 76.92 cfs Unit peak time Tp = .57598 hrs Unit receding limb, Tr = 2.30392 hrs Total unit time, Tb = 2.87990 hrs SIN: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Vol: Elev-Area Name.... SIENNA LAKE Page 6.01 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out Elevation Planimeter Area Al+A2+sgr(A1*A2) Volume Volume Sum (ft) ------------------------------------------------------------------------- (sq.in) (acres) (acres) (ac-ft) (ac-ft) 342.00 ----- 15.0078 .0000 .000 .000 343.00 ----- 16.2040 46.8063 15.602 15.602 343.47 ----- 16.6761 49.3184 7.727 23.329 344.00 ----- 17.4002 51.1106 9.030 32.358 345.00 ----- 18.5964 53.9849 17.995 50.353 346.00 ----- 19.8205 57.6156 19.205 69.558 347.00 ----- 21.0462 61.2909 20.430 89.989 348.00 ----- 22.1842 64.8381 21.613 111.601 POND VOLUME EQUATIONS * Incremental volume computed by the Conic Method for Reservoir Volumes. Volume = (1/3) * (EL2-EL1) * (Areal + Area2 + sq.rt.(Areal*Area2)) where: EL1, EL2 = Lower and upper elevations of the increment Areal,Area2 = Areas computed for EL1, EL2, respectively Volume = Incremental volume between EL1 and EL2 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Outlet Input Data Name.... Rectangular Page 7.01 File..._ G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out REQUESTED POND WS ELEVATIONS: Min. Elev.= 342.00 ft Increment = .50 ft Max. Elev.= 348.00 ft OUTLET CONNECTIVITY ---> Forward Flow Only (UpStream to DnStream) <--- Reverse Flow Only (DnStream to UpStream) < --- > Forward and Reverse Both Allowed Structure No. Outfall E1, ft E2, ft Stand Pipe RO ---> CO 343.890 348.000 Orifice -Area 00 ---> CO 343.720 348.000 Culvert -Circular CO ---> TW 322.290 348.000 Weir -Rectangular WO -_-> TW 344.720 348.000 TW SETUP, DS Channel S/N• DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Outlet Input Data Name.... Rectangular Page 7.02 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out OUTLET STRUCTURE INPUT DATA Structure ID = RO Structure Type = Stand Pipe ------------------------------------ # of Openings = I Invert Elev. = 343.89 ft Diameter = 4.0000 ft Orifice Area = 12.5664 sq.ft Orifice Coeff. _ .600 Weir Length = 12.57 ft Weir Coeff. = 3.330 K, Reverse - 1.000 Mannings n = .0000 Kev,Charged Riser = .000 Weir Submergence = No Structure ID = 00 Structure Type = Orifice -Area ------------------------------------ # of Openings = 18 Invert Elev. _ 343.72 ft Area = .0600 sq.ft Top of Orifice = .00 ft Datum Elev. = 343.72 ft Orifice Coeff. _ .600 S/N: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Outlet Input Data Name.... Rectangular Page 7.03 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Fondpack\Sienna Lake Post - revised out OUTLET STRUCTURE INPUT DATA Structure ID = CO Structure Type = Culvert -Circular ------------------------------------ No. Barrels = 1 Barrel Diameter = 2.0000 ft Upstream Invert = 322.29 ft Dnstream Invert - 320.63 ft Horiz. Length = 167.00 ft Barrel Length = 167.01 ft Barrel Slope - 00994 ft/ft OUTLET CONTROL DATA... Mannings n = .0220 Ke = .7000 Kb = .035544 Kr = .7000 HW Convergence = .001 INLET CONTROL DATA... Equation form = 1 Inlet Control K = .0210 Inlet Control M = 1.3300 Inlet Control c = .04630 Inlet Control Y - .7500 Ti ratio (HW/D) - 1.146 T2 ratio (HW/D) = 1.486 Slope Factor = -.500 (forward entrance loss) (per ft of full flow) (reverse entrance loss) +/- ft Use unsubmerged inlet control Form 1 equ. below T1 elev. Use submerged inlet control Form I equ. above T2 elev. In transition zone between unsubmerged and submerged inlet control, interpolate between flows at T1 & T2... At T1 Elev = 324.58 ft ---> Flow = 15.55 c£s At T2 Elev = 325.26 ft ---> Flow = 17.77 cfs SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10.01 AM 10/16/2006 Type.... outlet Input Data Name.... Rectangular Page 7.04 File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out OUTLET STRUCTURE INPUT DATA Structure ID = WO Structure Type = Weir -Rectangular ------------------------------------ # of Openings = 1 Crest Elev. = 344.72 ft Weir Length = 2.90 ft Weir Coeff. _ .600000 Weir TW effects (Use adjustment equation) Structure ID = TW Structure Type = TW SETUP, DS Channel ------------------------------------ FREE OUTFALL CONDITIONS SPECIFIED CONVERGENCE TOLERANCES... Maximum Iterations= 40 Min. TW tolerance = .01 ft Max. TW tolerance = .01 ft Min. HW tolerance = .01 ft Max. HW tolerance = .01 ft Min. Q tolerance = .00 cfs Max. Q tolerance = .00 cfs S/N: DOYXYWGX9N72 Crafton, Tull & Associates Pondpack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Composite Rating Curve Name.... Rectangular Page 7.05 ***** COMPOSITE OUTFLOW SUMMARY **** WS Elev, Total Q Elev. Q ft cfs 342.00 .00 342.50 .00 343.00 .00 343.50 .00 343.72 .00 343.89 2.14 344.00 4.28 344.50 24.53 344.72 36.84 345.00 43.40 345.50 44.75 346.00 46.39 346.50 48.19 347.00 50.08 347.50 52.01 348.00 53.94 Notes -------- Converge ------------------------- TW Elev Error ft +/-ft Contributing Structures -Free Outfall (no Q: RO,OO,CO,WO) Free Outfall (no Q: R0,O0,CO3W0) Free Outfall (no Q: RO,OO,CO,WO) Free Outfall (no Q: RO,OO,CO,WO) Free Outfall (no Q: RO,OO,CO3W0) Free Outfall OO,CO (no Q: RO,WO) Free Outfall RO,OO,CO (no Q: WO) Free Outfall RO,OO,CO (no Q: WO) Free Outfall RO,OO,CO (no Q: WO) Free Outfall RO,CO,WO (no Q: 00) Free Outfall RO,CO,WO (no Q: 00) Free Outfall RO,CO,WO (no Q: 00) Free Outfall RO,CO,WO (no Q: 00) Free Outfall RO,CO,WO (no Q: 00) Free Outfall RO,CO,WO (no Q: 00) Free Outfall RO,CO,WO (no Q: 00) SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Pond E-V-Q Table Page 8.01 Name.... SIENNA LAKE File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out LEVEL POOL ROUTING DATA HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Inflow HYG file = NONE STORED - SIENNA LAKE IN Dev100 Outflow HYG file = NONE STORED - SIENNA LAKE OUT Dev100 Pond Node Data = SIENNA LAKE Pond Volume Data = SIENNA LAKE Pond Outlet Data = Rectangular No Infiltration INITIAL CONDITIONS Starting WS Elev = 343.72 ft Starting Volume - 27.540 ac-ft Starting Outflow = .00 cfs Starting Infiltr. _ .00 cfs Starting Total Qout= .00 Cfs Time Increment - .0500 hrs. Elevation Outflow Storage Area ft ------------------------------------------- cfs ac-ft acres 342.00 .00 .000 15.0078 342.50 .00 7.652 15.6002 343.00 .00 15.602 16.2040 343.50 .00 23.830 16.7167 343.72 .00 27.540 17.0157 343.89 2.14 30.453 17.2487 344.00 4.28 32.358 17.4002 344.50 24.53 41.206 17.9933 344.72 36.84 45.194 18.2574 345.00 43.40 50.353 18.5964 345.50 44.75 59.803 19.2036 346.00 46.39 69.558 19.8205 346.50 48.19 79.620 20.4288 347.00 50.08 89.989 21.0462 347.50 52.01 100.653 21.6114 348.00 53.94 111.601 22.1842 SIN: DOYXYWGX9N72 PondPack (10.00.016.00) Infilt. Q Total 2S/t + 0 cfs ----------------------------------- cfs cfs .00 .00 .00 .00 .00 3703.34 .00 .00 7551.41 .00 .00 11533.49 .00 .00 13329.39 .00 2.14 14741.27 .00 4.28 15665.64 .00 24.53 19968.29 .00 36.84 21910.59 .00 43.40 24414.32 .00 44.75 28989.26 .00 46.39 33712.62 .00 48.19 38584.39 .00 50.08 43604.57 .00 52.01 48767.93 .00 53.94 54068.98 Crafton, Tull & Associates 10:01 AM 10/16/2006 Type.... Pond Routing Summary Page 8.02 Name.... SIENNA LAKE OUT Tag: Dev 25 Event: 25 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out Storm... TypeII 24hr Tag: Dev 25 LEVEL POOL ROUTING SUMMARY HYG Dir = G:\068009-01 Sienna Phase TI\eng\Drainage\Pondpack\ Inflow HYG file = NONE STORED - SIENNA LAKE IN Dev 25 Outflow HYG file = NONE STORED - SIENNA LAKE OUT Dev 25 Pond Node Data = SIENNA LAKE Pond Volume Data = SIENNA LAKE Pond Outlet Data = Rectangular No Infiltration INITIAL CONDITIONS Starting WS Elev = 343.72 ft Starting Volume = 27.540 ac--ft Starting Outflow = .00 cfs Starting Infiltr. _ .00 cfs Starting Total Qout= .00 cfs Time Increment = .0500 hrs INFLOW/OUTFLOW HYDROGRAPH SUMMARY Peak Inflow = 401.36 cfs at 12.5500 hrs Peak Outflow = 47.64 cfs at 15.6000 hrs ----------------------------------------------------- Peak Elevation = 346.35 ft Peak Storage = 76.530 ac-ft MASS BALANCE (ac-ft) -------------------------- + Initial Vol - 27.540 + HYG Vol IN = 80.898 - Infiltration = .000 - HYG Vol OUT - 80.812 - Retained Vol = 27.626 Unrouted Vol = -.000 ac-ft (.000% of Inflow Volume) WARNING: Outflow hydrograph truncated on right side. SIN- DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Type.... Pond Routing Summary Page 8.03 Name.... SIENNA LAKE OUT Tag: Dev100 Event: 100 yr File.... G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\Sienna Lake Post - revised out LEVEL POOL ROUTING SUMMARY HYG Dir = G:\068009-01 Sienna Phase II\eng\Drainage\Pondpack\ Inflow HYG file = NONE STORED - SIENNA LAKE IN Dev100 Outflow HYG file = NONE STORED - SIENNA LAKE OUT Dev100 Pond Node Data = SIENNA LAKE Pond Volume Data = SIENNA LAKE Pond Outlet Data = Rectangular No Infiltration INITIAL CONDITIONS Starting WS Elev = 343.72 ft Starting Volume = 27.540 ac-ft Starting Outflow = .00 cfs Starting Infiltr. _ .00 cfs Starting Total Qout= .00 cfs Time Increment = .0500 hrs INFLOW/OUTFLOW HYDROGRAPH SUMMARY Peak Inflow = 526.27 cfs at 12.5500 hrs Peak ----------------------------------------------------- Outflow = 51.11 cfs at 16.2500 hrs Peak Elevation - 347.27 ft Peak Storage = 95.688 ac-ft MASS BALANCE -------------------------- (ac-ft) * Initial Vol = 27.540 * HYG Vol IN - 106.290 - Infiltration = .000 - HYG Vol OUT - 106.164 - Retained Vol = 27.665 Unrouted Vol = -.001 ac-ft (.001% of Inflow Volume) WARNING: Outflow hydrograph truncated on right side. SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 Appendix A A-1 Index of Starting Page Numbers for ID Names ----- R ----- Rectangular... 7.01, 7.05 SIENNA LAKE_.. 6.01, 8.01, 8.02, 8.03 ----- T ----- TYPE II 25/100... 2.01, 2.02 ----- W ----- Watershed... 1.01 WATERSHED 1... 3.01, 4.01, 5.03, 5.04 WATERSHED 2... 3.03, 4.02, 5.05, 5.06 WATERSHED 3... 3.05, 4.03, 5.07, 5.08 SIN: DOYXYWGX9N72 Crafton, Tull & Associates PondPack (10.00.016.00) 10:01 AM 10/16/2006 (GiCrafton, Tull & Associates, Inc. 1D025 Financial Center Parkway, Suite 300 Little Rock, AR 72211-3554 501.664.3245 Fax 501.664.6704 www.craftontull.com E n g i n e e r s & S u r v e y o r s \\ \\\ � ,!.�S V'&17, \ ,Aa 7 pad., _ .\ ,, }. o 1 1�<\ `\\ '� ° � 4v\ _ rP ' `-9 NY 9221`'CAC,\ !J a r.✓: �\ �� i \\��t��\l�k�/�Y.: ( r L;. r�� m �� •j \,.O �- >� �9.452AC.�� \ it _ 7437� b LOPEN v ('�:. 1 it I SIENNA LAKE r % TITLE: SIENNA LAKE BASIN DRAINAGE AREA MAP Grafton, Tull &Associates, Inc. ` - j • v , -vv v SIENNA LAKE SUBDIVISION, PHASE II 10825 Finanoial Center PaB ay, style 300 \\\� Little Rock, AR 722113554 501.%4.3245 FAX, 501-s6aa70a www-craaontullcom A ' DATE: SEPTEMBER 21, 2006 E n g i n e e r s & S u r v e y o r s w�v>\vv� O VV A JOB 068009-01 �v © 2006 ®Grafton, Tull &Associates, Inc. PREPARED BY: BART J. MINK, P.E.